The fourth installment of a popular series, Call of Duty 4: Modern Warfare is split into two different, gameplay-wise, parts. The single-player campaign invites players to go through the episodic story, where players control six different characters. And even though the stories are taking place in different locations, the events of the campaign are happening simultaneously, creating the sense of urgency and painting a large-scale picture of the events. Multiplayer side of things in the Call of...