I agree with hale_bop about the party situation, but every club is different and every person is different. Some clubs I wouldn't be seen dead in due to the types that go there but some are fine, it's just trial and error for finding which ones you do/don't like. I met a guy a while ago in a club, he was a perfect gentleman and we sat in the chillout room for most of the night talking. we met again every week in the same club and talked. I was with him for five months and the only reason it ended was because of my need of space, in actuall fact he would have made a NT very happy I think.
But yeh, some people aren't exactly boyfriend/girlfriend material, after you have been going for a while you'll get an idea of who you want to avoid.