Family Guy - biggest crime of the century letting that one go. Fox is now bringing it back now that there's money to be made.
Father Ted - can be forgiven since the guy who played Father Ted died in real life - but it was a crying shame.
Spider-Man (90's) - I was TOTALLY annoyed when I was younger when they ended this series on a cliffhanger. What a stupid ending to a fine adaptation.
X-Men Evolution - I wish it would keep going but seeing as it kinda had a nice "final" episode, I don't mind so much.
Futurama - Like Family Guy, WTF were they thinking?
Ren & Stimpy - This show never got old. Nickelodeon killed this show.
this isnt really a cancelled show, but hockey. i mean, it's a show thats always on different channels, and it's cancelled for this season and i miss it and i loved it.
but i agree that cancellin Family Guy was the dumbest mistake ever made. that is the funnies show and i was sooooo happy when they announced they were gonna make another season!