I'm a frequent lurker in some comic critique reddits and forums and I have to say, the "art student art critique" is my favourite annoyance. You cannot evaluate comic art with the same critical lens you might use on a standalone piece, because comic art serves the purpose of telling a continuous story, and the only thing that matter is how well it does that one, singular job. My 50 page/3 chapter comic I'm working on right now is going to be 250 individual panels/images. That's a BOATLOAD of images - and that's a short (by comic standards) project. Sometimes shortcuts have to be taken in the interest of efficiency. Those shortcuts are stylistic choices, that may not be to the reviewer's liking.... but it doesn't make it wrong or even worthy of mention from a critical perspective.
That's not to say you can't have valid critique about the art aspect in general (if your shortcut is exceptionally anatomically incorrect, it's probably worth a mention), but I find that a LOT of amateur/inexperienced/disinterested "comic critics" will fall back on that because they don't actually understand comics well enough to critique anything else. In those comic critique forums, I've had to interject several times already when someone went on and on about how "someone's art is bad and needs to improve" when in reality they had a lot of movement and emotion in their art that actually did a very good job of telling their story. No, they weren't an amazing artist, no, I didn't like their stylistic choices, but their art did its job of telling the story... IMO it's actually kinda rude/lazy to choose to focus on the art when you can look at and critique the things that actually matter to a comic. Yeah if the art is so distracting that you CAN'T focus on anything else, sure, focus on the art, but just because STYLISTICALLY it's not your cup of tea, doesn't mean you get a pass on avoiding the important things when the art lays out said important things clearly enough. And if you ARE going to focus on stylistic things, you would focus on stylistic things that interfere with the telling of the story (i.e. you may focus on perspective, but your focus would be because the wonky perspective makes it hard to distinguish the action that's going on through the panels, not just "bad perspective, here's a link to 2-point perspective explanation")... not your personal preferences. And DEFINITELY not "make the women more sexy" which, I, unfortunately, have seen uttered as a "comic critique".
I do think it's a little much to expect someone to read 4 years worth of comic updates for a free review though. IMO 2-3 chapters (30-ish pages) is all you should ever really expect out of a reviewer, unless they actually end up liking your comic as they review it. They got lives and other projects to do as well. I would, however, think that if you're a reviewer who has a 4-year waitlist, that you'd maybe sample a more recent chapter just to give a perspective on where the comic is as of the day your readers read your review.