For some reason, most of the shows I like end up being cancelled before they've truly been given a chance, and yet we are subjected every week to a large number of awful shows that just seem impervious to TV death. It's not fair. I don't understand why this keeps happening.
There is, as always, a campaign to save the show (see: Save Carnivàle and Save Carnivàle Web Site). Sometimes these campaigns work. Sometimes they don't.