#xboxlive Death, taxes and a shooter atop the chart of Xbox Live's top activity. Since Major Nelson has publicized the numbers, the most popular game on Xbox Live—this is according to unique users playing the game while logging into the service, not just those playing multiplayer—has always been a first person shooter. Gears of War. Halo. And, for more than two years running, something from the Call of Duty series. More »