The overall style of this show. I'm starting to cringe on this show mainly because of the style. Though we all know that there are also shows like this (like The Marvelous Misadventures Of Flapjack), I'm not really seeing anything pass through it. Despite the exciting and original plot, funny humor, smooth animation and the beautiful title cards, it still has that certain animation that looked too lazy and careless because some of the characters change shapes. Such example would be Finn where he's originally tall and skinny, can sometimes look short and stout like a Mighty Bean. Jake is a default case seeing that there is no known extent to his stretchy powers.

They also have facial expressions that looked to be inspired from ragecomics much to my annoyance. That mixed with the simplistic style of Adventure Time, it'll look Off Model. Sad to say that, I would admit that I hate a certain show because of its style. I already hate Flapjack because of its style. Cartoon Network seems to just air any cartoon although the anatomy looks awful. Sorry but, those are not good cartoons in my book. Squishy squashy old cartoons that at least have consistent shapes of the characters are more watchable than this. You say don't judge a book by it's cover but I did just that. Call me shallow but it's the honest truth. It's what I think and if I have to rate this, it'd be: 2.5/5

EDIT: Okay, I just want to clear some stuff up. Maybe what I mean is, in my opinion, I thought when it comes to animation, the art style should be put into consideration. Yes, the cartoon has a plot and a good one I might add but it would be hard to take seriously if the drawings in the cartoon look like simple doodles rendered for the sake of being animated. Seriously, if you have a good story in your mind, write a book. But if you have a good story but decide to attempt a not-so Stylistic Suck-ish Art Style Dissonance, make some permanent concept designs for crying out loud. In fact, the style in its early seasons is more tolerable but later seasons made everyone look like their eyes more shrunken and faces farther apart.