I like parties with people I know, which tend to be the only ones I go too, though I did go to one at my friends house where I didn't know any of his roommates, was a really good party, I got trashed and fell up the stairs, it was amazing. Most on campus parties suck, and the only ones I've been able to have a good time at are off campus. we'll see if that changes tonight, granted it's going to be and one friend seeing how far we can make it through 2 cases of homemade wine before we pass out.
Sure, but meeting new people is also exciting and fun. I've been to lots of parties where there were only one or two people there that I knew, and they honestly often turn out to be a lot of fun. Granted, it's another type of fun than if it's with a bunch of people you know really well... Both type of parties can be great.