So then it would be like.
planet ✬✬✬✬✬ minus amount of users 15=?
nlobby4✬✬ minus amount of users 8=?
misc✬ minus amount of users 5=?
artschool ✬✬✬✬ minus amount of users 2=?
So even though artschool is almost empty it'd appear probably at the top due to it's high rating and how few users there are in the room. Of course this would change when the room fills up, but usually good rooms with good moderation...aren't full of people because most people thrive on chaos and stupid moderation etc etc.
This would be a good way to ensure that bad mods and trolls end up at the bottom of the list and good mods and productive rooms end up at the top.