I never thought that Halo would be in second place.Based on global unique users connected to Xbox Live for the week of January 14, Call of Duty 4 is the most played game over Xbox Live. Halo 3 previously held the top spot since its release in August 2007. Before that, Gears of War was the most popular Xbox Live game. All three games are first-person shooters. Both Halo 3 and Call of Duty 4 received GamePro's highest recommendation of 5 out of 5. We gave Gears of War a 4.75 out of 5.