With me, it was Dark Angel. I still cannot believe Fox made that bonehead move. First the ratings it was getting were solid, they just thought something shiny and new could do better (although that shiny new show, Firefly didn't even make it through a full season).
Plus, they had Jessica Alba locked into a long term TV contract, and given how her career and popularity exploded, I bet they kick themselves for giving up on that. Did I mention I think she is one of the hottest women alive? lol
But mostly, I liked the story, the direction of the show and the potential for more. So screw you Fox for canceling that show. Actually screw them for doing the same to other shows, but I'll wait on that