Dexter's Laboratory is probably my favorite cartoon of all time, much less the past 15 years. So what about the rest of ya'll, any specific favorites?
Revolutionary Girl Utena http://en.wikipedia.org/wiki/Revolutionary_Girl_Utena
I've always really loved Hey Arnold. Grim Adventures of Billy and Mandy was amazing as well. Invader Zim was super cool, but I wasn't allowed to watch it as a kid... and if I'm being honest and am not restricted to just the 90's, I'm choosing The Adventures of Jimmy Neutron. If you wrote this show of for being 3D animation and as being a crappy offshoot from the movie, well you sir are dumb. That show is just so funny all the time. I, literally have never laughed more than when watching that show. The stories aren't the most compelling, but the characters and their voice actors are what make that show.
My favourite North American cartoon of all time is probably Disney's Recess. I also really like Invader Zim.
I'm not going to count anime. I'm too much of a jerk to have a favourite.
EDIT: Forgot Ed Edd n' Eddy. Thanks @supermonkey122 for reminding me of that awesome show.
The mainstream stuff (Family Guy, Simpsons, South Park) has a consistent quality, but I'm partial to late 90's Toonami/Cartoon Cartoon/Cartoon Network cartoons, whether it's nostalgia or the cartoons were definitely amazing. I actually downloaded the entire run of Courage the Cowardly Dog - that shit is hilarious. Even as a kid, I felt I was 'above' dumb-looking shows like Johnny Bravo and Dexter's Laboratory, but looking back they're pretty funny.
Also, the various runs of Scooby Doo are still pretty funny, each in its own way - the old-school Scooby Doo is almost archive material, while Scooby Doo kids is plain ridiculous, especially since they're all stereotypes, even bigger ones than they are as adults.
Also, Futurama - Season 7, here I come!
Going back just 15 years to 1997...
- Primetime animation: Futurama
- Daytime/All-ages animation: [tie] Adventure Time & Kim Possible
- Anime: School Rumble
I don't have a list of favorite TV shows, but...
The 90's had the best animated entertainment for kids.
Disney Afternoon: Duck Tales, Tail Spin, Rescue Rangers, etc.
On the WB side, we had: Animaniacs, Tiny Toon Adventures, Batman The Animated Series
Those cartoons had production values up the ass, especially the WB stuff.