I would have gave this game a 10 but its multiplayer was just like MW3's multiplayer. Other than that, campaign was great and extinction is okay but I don't really like zombies or extinction. If you did like zombies though you're probably going to like extinction. If you've played COD for a long time you're going to be pretty happy, but if you haven't played that many COD games before, this is a great game to start with.
This is just my opinion, please don't make you're choice over this game just from my review.