I got lucky in one respect with my old dorm; I only had a roommate for a month, and he was a pretty nice guy.
The fucking heater in that dorm though.... There was a heater that was connected to every other heater on that floor, and if one person had it on, everyone had it on, and when it broke--which it did alot, due to some idiot or another with a vacuum cleaner or just a really bad, drunken idea--it defaulted to on full blast. So it was on 90% of the time when I would of preferred it on 0% of the time. This was made more irritating by the fact that I can't think when I'm too warm, or sleep, or breathe as comfortably as I would like. So I wound up having my window open every night when it was below freezing outside.
Then I got sick of the awful, lumpy, cardboard and springs like bed, and slowly shifted back to home and became a commuter student.