Batman: The Animated Series is top tier animation. The whole DCAU is superb. I think it starts with Batman, then Superman, then Batman: The New Adventures (though it's often lobbed in with BTAS), Batman Beyond, Justice League and finally Justice League Unlimited.
It's when kids aren't treated like idiots that great shows are made.
Much more comedic but also awesome are Phineas and Ferb and Milo Murphy.