Trying too hard
It seems the show is trying too hard to be quirky in the way better recent shows (primarily Chowder, Flapjack, Regular Show, and Adventure Time) are, but it tries in uncreative and unfocused ways. It's like they had sat in a board room and tried to brainstorm the most random characters they could come up with, and ended up with a mediocre mess.
As I stated in a previous post, it's quirkiness in the same way Hot Topic clothing is rebelious, which is to say it isn't - it's pre-packaged and pre-calculated 'comedy' in the same way Johnny Test is (shudder). It's cartoon painting-by-numbers.