Please don't base anything on what you see or hear at orientation! I had such a terrible time at orientation...I probably never would have enrolled in college if I had thought that my actual experience at the University would mirror my time at orientation! I had an airhead roommate, I got lost twice and the people I met who were going through rush were snobby.
But then I came to school and everything worked out fine. I think that you should go ahead and rush... remember, you can always quit if you decide it isn't for you. You've got nothing to lose and a lot to gain.