It just seems like you are either a huge fan of the series or you hate the Activision juggernaut. The Call of Duty series is every casual gamer's go-to game, and more often than not, it can be very frustrating. Like every other first-person shooter, CoD has a hardcore fan base, and they will defend the series like it is their dying wish. Simply put, you either love Call of Duty or you hate Call of Duty. Is it a rivalry in the gaming universe? Maybe not, but it certainly has divided a large contingent of gamers around the world.