My 2 Cents
Go! Enjoy! Rich Campbell and his team will really ake quite an effort to make sure your cruise is enjoyable. On the odd chance that you and a roommate don't match perfectly... so what. Get out of the cabin and enjoy what the cruise has to offer. If you are single you should wnat to meet people not stay in the cabin. Most of us will act reasonably and responsibly, so if you have concerns about your needs address them with your roommate before the cruise departs. I have known the Atlantis team for years and they really know how to make a guest feel welcome.
Mitchell