My top and bottom 5:
Best:
5. Danny Phantom: a great ORIGINAL superhero show is hard to find, but Danny Phantom fit the bill perfectly! If only it had a longer run
4: Spongebob (Pre-Movie episodes only): As bad as this show has become (we'll get to that later), the original was so fresh and entertaining! And, also, HILARIOUS!
3. Hey Arnold: What I loved about this show was that alot of episodes are sort of short character studies of the children (and adults) around Arnold rather than just about him. The charaters were very fleshed out, it was fun and funny to watch, and it even managed to be very touching in some cases.
2. Rugrats: Although this is partially due to nostalgia filter (it was the first cartoon I remember watching), the show is still great looking back at it!
1. Avatar: I don't think anything else needs to be said, it's Avatar!
Worst:
5. Post-movie Spngebob: WOW. Talk about derailment. They took a show that was groundbreaking, drove it into the ground, and they're not even bothering to try and get anyone inside the plane out so they can survive (ok, little morbid there, but you get my point.)
4. Tak: BORING. That's it. That's all that can be said about it. The most boring show I have ever seen.
3. Rocket Power: Boring, but also boring while doing that whole "HEY KIDS! IF YOU DON'T GO OUTSIDE, YOU'RE A LOSER, BUT YOU STILL HAVE TO STAY INSIDE AND WATCH THIS SHOW SO YOU CAN KNOW THAT!" thing that I have never liked.
2. The Mighty B: Every joke in this show was a visual gross out joke, making fun of how annoying Bessie is by letting her TALK ENDLESSLY (BTW, worst voice acting in ANY show), an SNL reference, or something so stupid it makes me facepalm
1. Fanboy and Chum Chum: again, don't have to say much. It's Fanboy and Chum chum.
*BONUS!!*: So Bad It's Good: Back at the Barnyard: it's absoloutley horrible, but it's so random and stupid that it's fun to watch how bad it is!