Fosters, maybe... but KND has some of the best writing I've seen in years. The X-mas special (I call it X-mas for a reason) had a brillaint send up of Marvel comics, even mocking the purple prose of Stan Lee (mimicking his True believers line). Plus the scripts were written by one Mo Willems, my favorite animator (or one of them).
I feel shows need quality refferences like that. Look at Jimmy Neutron... the dog is named after the guy who created Rocket Fuel. And another episode reffered to Death of a Salesman, calling a salesman robot "The Willy Loman 3000." it's all on the level of "Ruby yacht of Omar Kayam" type stuff that you don't get right away, and I feel those are the best jokes. They don't need to fart or make poop jokes like other shows.
Personally I'll take all the new CN cartoons over the live action filth that Disney calls "entertainment." How many Lizzy McQuire and Home Alone knock offs do we need? At least I can sympathise with animators of even the crappiest cartoons, since they actually had to go to school and learn to draw ultrarealistic stuff they'll never use (Cuz I did). I feel I could do better, sure, but the last bastions of cleverness died when KND and Billy and Mandy were kicked off. Camp Lazlo is just a sore reminder Rocko's modern life is gone. That's it.