Kotaku: Sure, people don't like Kotick and his DLC antics. Sure, the games been running on the same engine since CoD 4.
However, there is a reason for the game that sells millions upon millions of copies every year; Its core formula is the most solid, perhaps out of any first person shooter out there.
Let me preface this by saying I love all shooters. I play the hell out of Call of Duty, play the hell out of Battlefield. There are a bunch of reasons that I do go back to the CoD series every year but perhaps the most important of them all.