I'm in halls atm, been here for about two weeks. Worst thing is the noise, constantly drunken idiots shouting and making noise at night, you can't get a decent amount of sleep so I find myself falling asleep in lectures and missing work...etc.
This is a big problem, my girlfriend is in halls this year and it's pretty awful in that respect. I know students like getting drunk etc etc and we all go out and have a good time but people run up and down the corridors at 4am shouting, banging on doors, listening to very loud music at 3am, etc etc.
It's antisocial but nobody seems to care. She hasn't had a good nights sleep since she moved in

Makes me glad I never bothered moving out for Uni - although if you get with the RIGHT people, a student house can be a LOT of fun.
Just halls with random idiots = nightmare. It's like they've suddenly realised Mum wont tell them off for being up late and they are milking it with no respect for anyone else whatsoever.