The attributes aren't so much put there to attract people, as it is to advertise your map.
If you post an RPG, because its rare to find one, I tend to join it, but if its not an actual RPG, I give a 1 star and leave, because you've wasted my time.
If you want people to join, advertise your maps in so.e way, either in other people's maps, with a forum topic, or some other way.
The best way to get people to join, is make a fun map. If its fun, you'll get repeat players joining in, as well as their friends, and friends of friends.