User blog comment:Bovell/Black Ops becomes top selling U.S. video game of all time/@comment-71.253.203.170-20110311232703/@comment-71.253.251.46-20110312110837

MW2 released maybe about 4 trailers. Black Ops released a lot of trailers, gameplay videos, plus the whole "There's A Soldier In All Of Us" thing which is probably what got it most of the game's sales.