I always thought it would be better if the player got to choose who they played with. Let me tag other players, and feed that into a ratings engine. Match me up with players who tag like me, and not with players that people who tag like me tag as arseholes, and untagged players. Lets put the social media perception filter to good use. Could be even better on MMORPGs, where you can populate worlds with players who will have fun with each other and speak the same language and do the RPG part in similar ways.