Although the Call Of Duty series seems to rub a lot of gamers the wrong way, there can be no doubt that the series is one of the most commercially successful franchises of all time from humble beginnings. In 2008, Infinity Ward took Call of Duty out of the WW2 trenches and into modern day battlefields, which was both a haunting revelation and a huge key to success. Modern Warfare began an FPS revolution,creating entirely new breeds of players, all of whom were connected into a vast world of online competition. Granted, COD did not start the online multiplayer craze but the context of these players was perhaps most interesting. https://www.youtube.com/watch?v=v60Rf5o6KYA There were players who had never even played games before coming into Modern Warfare, people who may have purchased an XBox 360 or PlayStation 3 just to get into the fight. It moved systems and created new players, some of them not even touching the single-player campaign in favor of shooting up their buddies. The shift from hardcore gamers only to mainstream, mass-marketed appeal was enormous, creating a whole new genre that still persists today.