I joined a sorority with no reputation. Does that count?
(It was a newly founded local sorority.)
Rush at my school used to be the first thing freshmen did, so PNMs didn't really have a chance to find out what the chapters' reputations were. If I had known the reputations of all the sororities on campus before going into rush, I hope I would have had the wisdom not to prejudge each chapter, but instead to go through rush, meet the sisters for myself, and follow my heart.