I've moved a lot, and have held plenty of bad roommates (but some really good ones too). I've also been a bad roommate.. (I'm really messy.. G-lo can attest to that.). I think at this point of my life I can only deal with living with a S.O. or alone (although I've never lived alone.. so can't really guarantee that I could do that either)
Bad roommate situations:
Being the only girl in a 7-9 dude punk house (the numbers varied). I shared a basement with 4 other guys. There were no 'rooms'.. just a bunch of mattresses in a basement. The roommates were ok, but people weren't good at buying toilet paper. Usually it was down to a bunch of zines (ever wipe with MRR? It doesn't do the trick). It was a party house next door to the all-ages space.
The guy who booked the space next door didn't live at our house, but he'd tell bands they could stay with us (but never asked/warned us in advance) Any given night, there were between 10-20 people staying at the house. So many cockroaches. Such a fucked situation. They were all super PC vegetarians who were freaking out over the fact that I would cook (and eat) meat. My rent was dirt cheap (65/month), but after 3 months.. I had to move out. Funny enough, that band the Voodoo Glow Skulls helped me move my shit from the basement to my car (I think this was in 1991? 1992?) Immediately after living there, I scored a place to stay in this ridiculous penthouse apartment in downtown Indianapolis (16th and Penn). It was some ridiculous 4 bedroom 3 bath place that a bunch of art school kids rented. 2 of them were on a cross country roadtrip for the summer, so their other roommate let me stay there for free. I ate all of their perishable food (it would have gone bad before they returned, so I had zero guilt), and enjoyed living rent free.
Other bad roommate situation: Living with 3 other girls. It wasn't so bad to begin with.. but turned out that one of them LOVED having big ass parties. That part wouldn't have been so bad, but she flyered the nasty ass trust fund art school coke bar. The parties would wind down around 2am, but once the bars closed, we'd get a surge of another 25-75 people (usually around 3am). Douchebag central. Our toilet couldn't handle that much use in one night, so the next day we'd usually have to deal with an overflowing toilet and a visit from a plumber. good times!
Bonus: the roommate who LOVED to party and have big parties, wasn't so good at cleaning up after the party.