I am going with Genndy Tartakovsky's works

Dexter's Laboratory:

http://www.youtube.com/watch?v=5U9uOWRaN34

Samurai Jack:

http://www.youtube.com/watch?v=bmkxsQnNujI


Star Wars: Clone Wars 2003:

http://www.youtube.com/watch?v=WQYw5lTwaPw

Genndy made the Star Wars Prequals awesome with his own mini series :D

Samurai Jack easily. Got all four seasons....... they really need to come back to this one and either make one more season or a movie to finish the story.

http://1.bp.blogspot.com/_BxHfdBYyRpI/S934cWbUrHI/AAAAAAAAABg/RBy9wUHnkkA/s1600/dexter_final.jpg

also, Powerpuff Girls.

Samurai Jack for sure.

Though PPG and Dexter's Lab are both superb and tie for second for me. The one episode of EE&E where they realize they're in a cartoon and start manipulating the universe is probably the best single episode that was ever aired on the network, though.

Aaaaadventure Time!

Adventure Time for the newschool ones.

For the old-school ones, Ed, Edd & Eddy, Dexter's Lab, Powerpuff Girls, almost all of them.

Definitely Ed Edd n Eddy

While the later seasons took a dramatical drop in quality, the first seasons are some of the best cartoons I have ever seen, a lot of heart and soul was clearly put into them

Samurai jack is a close second, with almost every episode being awesome.

http://www.youtube.com/watch?v=YHrGVcthvB8

For some reason I always hated Hanna Barbera stuff

Even as a kid I hated watching the cartoons you listed above, all of them seemed so bland, unfunny and boring

Well alright, two stupid dogs was moderately funny

The best Cartoon that Hanna Barbera made was Swat Kats, now that one was balls to the wall awesome

Adventure Time
Mathematical!

bump

No love for The Boondocks or ATHF? I'm so sad.

Grim & Evil. I love that one scene, where Billy picks his nose so deep he pulls out his brain. Then he looks to the left, he looks to the right, and then he swallows it :P

Ed, Edd & Eddy
Cow & Chicken