There where a couple shows that Cartoon Network has done that wern't too bad although they wern't on the same level as Avatar, Gargoyles etc. Off the top of my head I can think of Ed, Edd and Eddy and Fosters Home for Imaginary Friends. But shows like
Adventure Time and its ilk are just......wrong.
I'm proud to say that I forsaw the crap fest that is the Avatar Movie (The airbending one just in case I need to clarify, the other one was AMAZING

) and have not disgraced the series by watching it nor will I