There's something about the CoD series that I just don't get. I've tried the MP in a few installments and got bored with it pretty quickly. Maybe it's because my FPS of choice is Halo, which is extremely different. I don't quite get why this game got a 4/5 though, as the review made it sound like a pretty run of the mill shooter.
It'll be interesting to see how the numbers pan out for this game - I feel like it didn't get nearly as much marketing as the other games, maybe because they realized it was going to be hard to compete with GTA V. I'm sure it'll still sell like crazy, perhaps the lack of marketing was simply due to audience's familiarity with the CoD series.