Every room you create is Rated unless you switch it to Casual. Classic, Futsal, Real Match, Sniper, Headball, Pool, Ice Hockey, Basketball, Volleyball, Tennis and Table Tennis each have their own rank and leaderboard, so a futsal specialist climbs the Futsal ladder and a pool shark the Pool ladder. Chaos and Mini Golf are just for fun.
The lobby tells you whether the next match counts. A match counts when both teams have the same number of players, nobody is a bot, at most one guest per team (counted as 1000 MMR, not rated), the line-up stays the same and it ends normally. Leaving a rated match counts as a loss.