I know it's not an MMO, but Grand Theft Auto V Online lets up to 16 people play together online. You default to joining a game with members of your Crew or Friends list, and it unfortunately doesn't cross platforms between the XBox 360 and PS3. So if anyone else is playing GTA V on the PS3 and is interested in building a Crew of like-minded players, let me know. My PSN handle is Randeth. Thanks.