Betarulz! made a great post...
I honestly think that if I had rushed my first semester, it would have made a big difference in how I felt about my school - even if I hadn't joined, I would have met lots more people and thus liked it more.
Rushing doesn't mean you have to accept a bid, but my bet is if you rush and get a bid, it'll be from a chapter you love, and you'll want to join!