Check out the most played GFWL games of 2011. There are also other data like the most played XBL games of 2011; you can check them out over here.
Age of Empires Online is a Free to Play game, so it topping the GFWL charts is not unexpected. GTA IV is at no 2nd followed by Batman: Arkham City.
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Games for Windows LIVE Top LIVE Titles (based on unique users)