Modern Warfare 2
The follow-up to the 2007 epic game Call of Duty 4: Modern Warfare.

Again, this game will cause you to scream your mind out at noobs who go 1 and 22 in team deathmatch, or your friends who appear to believe they can beat you.

Either way, hilarity will ensue, but with better graphics and better weapons.
Modern Warfare 2 will completely decimate the other Call of Duty games.