This is a great topic. Using just the cartoons mentioned in the original post my rankings would be:
Rocko's Modern Life > Hey Arnold > Ren & Stimpy > Doug > Rugrats > Ahhh Real Monsters > Angry Beavers > Invader Zim
The only one of those I don't actively like is Invader Zim. I just never really thought it was funny or got behind it. But the rest are classic.
--
http://img.imgcake.com/crimjpgpe.jpg Mo' buildings mo' problems
ocean kinda grew on me like a flesh eating ...fungus. -BIGPUN9999