Boy have I got a list!
Favorites —
Arthur: Great kids show, it didn't talk down to the audience at all. I still find enjoyment watching it, though the new seasons with the awkward flash animation isn't as charming as the good old episodes.
The Magic School Bus: It made me appreciate science, 'nuff said.
Jackie Chan Adventures: The first show I watched that had Chinese protagonists! I was so stoked to see Chinese folklore incorporated into a mainstream TV show! And it was set in San Francisco, just 40 minutes from where I grew up! The art style was unique and inspired and it was an all-around fun adventure!
Static Shock: One of the few super hero shows I actually cared about. The characters were down-to-earth and believable. I usually never sympathize with lead superheroes, but Static/Virgil was great. I could see myself being friends with him and Richie. It was urban but not over-the-top. It was fantastic to see such a diverse cast as well.
Xioalin Showdown: Bottom line, I loved the style and characters. It felt epic and even though it was a little campy, it didn't feel campy.
Young Justice: Again, I never really was into superheroes, but this show kept my interest. I thought it was very well written, even with the second season when everything felt rushed. I was outraged when they canceled this series.
Guilty pleasures —
These aren't my favorites necessarily, but I get excited talking about them once I get over my embarrassment.
Storm Hawks: It was a pretty basic storyline, and a little cheesy, but man did it deliver. Characters were pretty awesome, especially Stork, my favorite.
Hot Wheels Battle Force 5: Also very cheesy and basically a 20 minute long commercial, but the characters very well won me over, particularly the Cortez brothers, Stanford, and Tezz.
More adult cartoons —
The Simpsons: Always will be close to my heart, since it made such an impact on me growing up. I'm only counting the first 20 seasons, after that I stopped watching every episode. I rarely tune into the new ones as I find them flatter and with less heart, though they still have their moments on occasion.
Bob's Burgers: Omg, the humor is on point, especially the Belcher kids! I like pretty much every character, except for Mr. Fishoder. I usually don't like musical numbers, but the ones on Bob's Burger are all right in my book. Sometimes I even love them, case in point, "Electric Love".
Superjail: The animation, especially for the grand destruction sequences at the end of each episode, wow me every time. I also like how touching it can be at times, like for Cancer's episode.
Metalocalypse: These boys are just ridiculous. Favorite episode has to be the one where their families visit. And Toki is just too precious.
Least Favorites —
Well I don't really watch anything if I already am turned off by the commercials but I'll make a list of the ones where I watched one or two episodes and really didn't like.
Happy Tree Friends: Really not my humor, I dunno, it doesn't feel smart or clever to me. The gore leaves a bad taste in my mouth (lol and yet I like Superjail and Metalocalypse). I suppose since it's with cute furry critters.
A lot of the 90's early 2000's Nick cartoons like Rugrats, Hey Arnold!, As Told By Ginger, Rocket Power, Angry Beavers, Cat Dog, I'M SORRY. It's not like I hate them, I just don't care for them. They never struck a chord with me.