For my current favorites, Futurama and South Park are tied for #1, followed closely by The Simpsons, Family Guy, Robot Chicken, etc. My favorite classics are Animaniacs, Looney Tunes, Tom & Jerry, Edd, Ed & Eddy, Rocko's Modern Life, SpongeBob, Hey Arnold, Doug, Ren & Stimpy, Fairly OddParents, Rugrats, Dexter's Lab, KaBlam!, Invader Zim, I may be missing a few of them but that's the majority of the classics I enjoyed as a kid.
I feel like I should start watching Adventure Time. I've heard nothing but good things about it, and I feel like there's just so much I'm missing out on. Same with The Regular Show. But I dunno, are there any bad things people have to say about those two shows that I should take into consideration?