Sealab was great before the guy who voiced Captain Murphy died. It was even good after that, but it was hit or miss.
Aqua Teen Hunger Force was great, but after a while it got too weird.
Harvey Birdman was pretty funny at times, but overall not as good.
Home Movies is great, but its working on a different level. You don't have to be high or stupid to watch it like ATHF.
Stroker & Hoop was also pretty good. I know it was an homage to cheesy P.I. dramas, but it still seemed the show was written and voiced by amateurs at times.
I also liked The Boondocks, but have never gone out of my way to watch it.
The rest of the stuff is crap - including Robot Chicken.