>>123706794The show was too different and goofy from the likes of Adventure Time (S3-onwards), Gravity Falls, and Steven Universe, so that would already give it some trouble. Making a dopey idiot like Uncle G the star of the show--with an annoying voice to boot--likely didn't help, either.
I've heard there were complaints about Pizza Steve being "too annoying," but that's negated by the fact he was usually pretty funny when paired with Mr. Gus. Conflict makes good comedy a lot of the time. But I think the show's biggest barrier was the title: "Uncle Grandpa" made A LOT of people think the worst when it was really just a silly name to describe that wacky older "uncle" or "grandpa" figure a lot of kids had growing up. The show wasn't perfect by any means, but I thought it was fun and inventive. I'm a sucker for cartoony cartoons.