Well game room is bit in that direction. It would be nice if they could make something community related. Like a MS forum where you can have discussions about games or can ask for help if your stuck in a game that you enter on the dashboard. Like go to this game's marketplace but then also go to this game's (forum) board.
Talking about Home...I remember I played something not long ago with machines that I liked...
Edit: Sodium you should try it out in home. It is not great but I must say it is ejoyable for a while: