What Game is the Best M Rates Game you can have

Right Now Call of Duty Black Ops is the best Selling in total retail sales of individual games. None of the exclusive games even have a chance to become the best selling. Grand Theft Auto as a series has outsold Call of Duty series. MW3 is probably the best M rated game to release in November 2011, but there are a number of other favorites like Battlefield 3 and Uncharted 3 or even Elder Scrolls V