Angry Beavers
Cow and Chicken
Ren and Stimpy
Hey Arnold
Danny Phantom
Drake and Josh
Chalkzone
Pre-Movie Spongebob
Fairly Odd Parents (older episodes)
Rocko's Modern Life
Jimmy Neutron
My Life as a Teenage Robot
Invader Zim
Doug
Catdog
Rocket Power
Catscratch
And Avatar the Last Airbender, which might be my number 1 favorite of any of their shows. It had the comedy, while also having one of the most serious, deep, and well though out plots of any cartoon, or most shows, that I have ever watched.
Worst:
All the live action shows they do now.