There is not a single game that have a mandatory rule about graphics in order to work, but nothing worked so well in gaming history as a FPS with "realistic graphics of manly man doing manly things" with MW in the cover. But in order to that happen, we needed Doom guy, Wolfenstein guy, Blood guy, Outlaw guy, Duke guy, Unreal guys and girls, 007 guys and girls, XIII guy and girl, Quake and Timesplitters guys, girls, robots, fish tanks, monsters, carcasses and the list can go on. Realistic graphics are the new tool at disposal of the developers, but if to get here so much have happened before. That 2K guy had forget about all the other games that happened before, that created and shaped the genre. I just can't understand how someone who make games can just ignore all the history and legacy that is behind the modern shooters.