Call of Duty will forever remain known as a multiplayer behemoth but that doesn't mean players should sleep on the campaigns of the popular first-person shooter. The plot might have suffered from being a token part of the game until the Modern Warfare series which added story developments and intense explanations of the multiplayer battles. Modern Warfare 2 contained the tradition with its fair share of mesmerizing (and controversial) moments. Other games might be harder to beat, but few are better.