I know this is sort of beating a dead horse but Steven Universe.
It had such good world building and interesting fantasy characters. However the writing is pretty weak. They needed one head writer who knew what the were doing and a script doctor to fix some of the dialogue.

I guess I was also let down by Yuri on Ice.
I guess the issue I have with some anime is that they start out interesting but once they get into the core plot, it just get muddled. Felt like they just padded the second half with all the skaters doing their thing, and I was like "I do not care about these characters". But I guess that is just the tournament arc anime trope which I am not a fan of.

Vampire Knight drives me nuts because of this.

The premise on paper sounds awesome:

There's a school where vampires and humans both attend as students; the human students during the day and the vampire ones at night. To keep this orderly and stop the human students getting hurt, there are these badass knights who are ordinary humans trained to be super-good at fighting vampires. The protagonist is a new one of these knights, a girl who attends the school and keeps the vampire students in line.

I read this premise and thought "oh my god. This sounds awesome! It's a shoujo manga about a human girl surrounded by hot vampires she has to keep in line, like a cross between Buffy and Fruits Basket!? SIGN ME UP!"

....Except in practice, it doesn't...deliver. The vampires are barely threatening and don't seem to struggle to control themselves, which is fortunate because the heroine is terrible at her job, extremely passive, doesn't seem to have any authority, skill or strength and mostly just gets rescued a lot by a bunch of really bland, interchangeable vampire boys. It lacks all the tropes and aesthetic you'd want from a vampire story, and somehow manages to be worse at doing this premise than Vampire Academy (okay actually I'll admit, I like the graphic novel adaptation of Vampire Academy because it cuts out a lot of the protagonist's internal monologue and messing around making her much less whiny and passive).

Miraculous Ladybug
Series 2 was so good, and I was hoping that Alya and Nino would keep their miraculouses, and that Chloe would keep hers after a redemption arc... but it just became a formulaic mess instead, they undid Chloe's character development, and Marinette went from "smitten schoolgirl" to "creepy stalker."

Felix the Cat the Movie. I saw it and I felt that Oriana had the potential to be such a creative fantasy world. Instead, the idea of trying to expand on the worldbuilding was shoved aside by the producers, and the film failed, which means we won’t see the Oriana world expanded any time soon.

Downsizing (2017) is such a letdown to me (even after all these years). Concept has so much potentials, but the movie direction went dull after the protagonist's transformation. The story does not dig deeper or play around the 'downsizing' concept, it went into another adventures that can be seen as a separate story.

The Jurassic World movies. Obviously haven't seen Dominion yet.
I think the first tried to do too much, and the characters were so flatly written.
And the second one was just plain lazy and forgettable.

For me it's Shoujo Kageki Revue Starlight. And the anime is honestly not even that bad; if you're willing to ignore the silly ending. It just could have been SO much better.

I wasn't a theater kid and I never knew any growing up, but I think even I could write a better story about girls who attend an elite acting school by day and a battle royale for a mysterious power by night.
For some reason, even though it's the exact same group of girls involved in both activities, the writing just refuses to connect them in any meaningful way.

"Win the Revue and become the Top Star, the best actress ever!" ---> Actually, being the Top Star has nothing to do with acting; you just get a wish. This isn't a 'twist' or anything, it's just something the writers overlooked. O_o

"Sing and dance upon the stage, and show off your 'brilliance'!" ---> Actually, you win in the Revue by cutting off your opponent's "cape"-- which is a really cool and dramatic visual, complete with its own unique sound effect, but it STILL has nothing to do with acting. During the Revues you don't even get the sense that the girls are trying to outdo each other in showmanship; they're basically just fighting.

"Oh no: being the Top Star means you steal everyone else's 'brilliance'!" ---> Actually, there's been a Top Star in play the whole time, and none of the other characters seem any less 'brilliant' (and the Top Star herself is basically a background mom-friend before she becomes a twist villain...no one pays any special attention to her). There go the only stakes in the show. O_o O_o O_o

And despite all those plot holes, the Revue is kind of the only part of the show worth watching.
The real-world parts that are supposed to be the most relevant (the acting classes, the Starlight play the entire story revolves around) are actually the most ignored. T_T It's as if the people writing the anime have no real interest in theater, but hope that if they make the characters talk about it enough it'll seem important.

Case in point: Starlight itself is the most dull-looking play I've ever seen. I mean, it doesn't look dull; the set design is fantastic (by the way, there's an entire half of the school devoted to non-actors, people who do lighting, sets, costumes...they are ALL unimportant background characters who literally only exist for worldbuilding).

But Starlight isn't tableau vivant, it's supposed to be a play. The actresses are supposed to do more than stand around and look cute while yelling out exposition in monotone voices (they're really going to a special school to give a kindergarten-level performance??). But nope, that's all we get. =/ And this is what we're supposed to be concerned about, this is the play so beloved by one of the characters that it damn near drives her insane. And it's just...so boring.

The anime is very pretty, and its characters are cute (and the music is phenomenal~), and it plays to those strengths well, but beyond that it's just devoid of substance for no real reason. There are plenty of elements in it that could actually be suspenseful and interesting, but they remain undeveloped in favor of cheap 'dark magical girl' tropes. Seriously, it feels like a show that secretly, desperately wants what Madoka Magica has, when it would be much better off focusing on its own premise.

Riverdale. I haven't watched an8d episode, but I've seen so many thinkpieces about how the first season was good but everything past that is a chaotic mess. Taking classic characters and putting them in a new setting or genre is generally a good way to shake up previous dynamics and introduce new challenges... but it can easily result in an underwhelming plot if characters aren't handled well.

I thought "Inkheart" had a cool power of reading stuff to life however, I do not care about the characters, the plot or the anything. But that narration-creation powers, still fantasizing.

On a side note, recipes are sometimes like this for me. There are foolproof instructions you can not mess on for this delightful-whatever food, but I execute cooking poorly.

Morbius. Despite it's great action scenes, interesting villain, and Jared Leto looking it sucked everywhere else.

There is also the underworld Franchise, which did well for three movies, and then failed the remaining two.

Death:rescheduled by snailords or anything by snailords really, the plot is people are able to kill people legally and the mc wants to change the law, so pretty much hunger games kinda , but the authors strange writing ruins the story and every one is pretty much the same 2d character personality, plus the author pretends to date his mc which is really weird .

• In anime recently, Sakugan1. Great classic feeling first episode. Cheesy, not much mental power required for enjoyment. Then, other episodes are trash fire on top of a dumpster fire. The most "by committee" anime I've ever seen.

In gaming, ooh boy let's see:
* Hellgate london: Yes I am that old.
* Kingdoms of Amalur
* Dragon age Inquisition
* Dragon age 2
* Evolve
* Everything Hi-rez studios does
* Heroes of the storm
* Overwatch 2
* All WoW expansions after legion.
* Firefall
* Lawbreakers
* Dead space 3
* Stonehearth
* That Kojima Walking simulator. (That developer makes videogames out of manga plots and I'm losing my mind because no one sees it).
* Everyone who's trying to copy Rimworld and make a full game out of a Rimworld overhaul mod.

I'm getting into V Rising('cuz friends want to), which is from another red flagged studio for me. Can't wait to see this one crash and burn.

Oh and also my comic.

Scythes. Good idea for a farming tool, poor at putting people to death, actually.

Or I guess this joke

RWBY. God damn that series had so much potential and they have just continued to squander it with every single new season.

At least I can spend the next month or so fantasizing about how good Ice Queendom could be before it comes out and reality sets in and I have to accept that the actual product rarely ever lives up to expectations.

I dunno, man, if you somehow manage to get to the point where the 4th serial killer is introduced, or the 2 cults try to take over the town at the same time, or the part with the underground prison boxing ring, or the weird gay tickle fetish video thing, or the weirdly-incestuous-twins-except-one-of-them-has-been-dead-since-episode-one-and-his-corpse-gets-used-in-multiple-subplots part, or the third secret twin sibling has been introduced, or the part where they do a flashback that is literally the breakfast club AND the satanic panic over D&D in the 90s at the same time, and are still trying to take the show seriously, I really just think you haven't been paying attention.

The show really does its best to give you every single opportunity to jump off the 'taking it seriously' train and on the road to comedyville starting at the very beginning of season 2. It honestly shocked me to learn how many people DIDN'T get the memo that Riverdale stopped giving a single shit about doing anything other than being as stupid as possible a looooong time ago.