While it confuses me a little that the female transgender group got lumped into lesbian chat, it doesn't really bother me at the end of the day. I know a lot of people in that room complain about it but there are bigger things in life to worry about really.
Reading back through some of the other suggestions, I'm honestly happy that guests can enter rooms. Some of my favorite people to talk to are still guests. Deny them entry to rooms and you end up with people who can't connect with actual members, they miss out on a big experience of this site and not talking to people who are here regularly and for many different reasons.
I think the rooms we have now are quite good and well balanced. They seem to cover a wide audience and most of the time the theme of the room is respected. Personally I feel that more rooms would be almost intimidating.