The late 2000s were a period where shooters blossomed, largely in part to the ongoing popularity of Halo, newcomers like Gears of War, and the rise of Activision’s cultural juggernaut, Call of Duty.

Without a shadow of a doubt, Call of Duty is primarily a multiplayer game. Following the meteoric rise of the original Modern Warfare’s PvP, the series has become an industry behemoth, and its success ...