It may sound like an obvious statement, but Call of Duty is a wildly successful franchise. Its also a franchise that is sure to divide gamers into camps of those who love it and those who hate it.
The same can be said for Call of Duty: Modern Warfare. Everyone knows where they stand on this franchise. Even though Modern Warfare is something of a soft reboot, it does little to either win over past critics or alienate existing fans.
Source: N4G PC Call of Duty: Modern Warfare Review | Game Freaks 365