I came on site jabber to do the review for roomster.com - because it absolutely sucked with 1 fake lead and tries to auto-renew your membership, while roommates.com actually gave me real leads and got me a room.
So after reviewing roomster.com with 1/5, I decided to take a look here, and surprise, 1/5 also!
From my view roommates.com worked, so it deserves at least a 3/5.
Since the sites needs to make money, it's totally understandable to charge people for its service. Now, if only it allowed FREE members to read messages sent by PAID members, I'd give it a 5/5. I'd imagine it will drastically improve chances of a good match, and not as many messages sent with no reply.