12 Oz. Mouse is one of the worst shows to ever air on Adult Swim. Super Milk Chan was stupid, but it was at least stupid and silly enough where the utter awfulness as entertaining. I do not have high standards, as aside from one hugely unfunny episode, I've at least mildly liked all episodes of Tom Goes to the Mayor.
Squidbillies is bad, but last week's episode (about home schooling or whatever) was the best so far, even if it wasn't all that good.
What's awesome about Boondocks is that generally, it will only get better from here.