I like pretty much all stages, except for Samus stages and maybe the polygon stage too. It's too easy to get hit by lava and die even at 0% when you're at handicap 2 or 1 in Samus stage, the big rock with the monster on the background stage is annoying like hell when it moves and the computers set to max are impossible to overcome, and I dislike the polygon stage because it's a little too small. Hard to hide or get away without running into another ennemy... Again, at low handicap this become a problem fast. Also, Mr Game and Watch stage is really annoying too, because of the tools which rain down once in a while and which can also kill you in one blow.
Since I play mainly Captain Falcon, I have no problem whatsoever with stages which are pretty fast or move around much. Got to hate the camera angles sometimes though, the computer opponents don't mind getting off camera because they know exactly where they are... Not us.
