My favorites were:

G.I. Joe, Transformers, Voltron, Bionic Six, Silverhawks, Thundercats, Duck Tales, Gummi Bears, Dungeons and Dragons, the Real Ghostbusters, Kidd Video, Mask, Heathcliff, the Chipmunks (goes to the movies), Tom and Jerry (Freq Quimby version)

My least favorites:

Thundarr, Galtar, Darkwing Duck, Talespin, Chip n Dale Rescue Rangers, COPS, The Karate Kid, Rambo, most of the attempts to take a blockbuster movie and turn into a cartoon, most of hanna barbera, and of the Chuck Jone stuff..

I also actually hated Nickelodeon growing up. There was almost never any of the good cartoons on there.

What about you?