Once again the CoD franchise delivers us a great FPS that will enthrall old and new players alike.
The multiplayer shall be a good refreshment from Halo 3, in this case there are no shields, the shooting mechanics are actually more real, if you thought that playing as a sniper would be easy, only because you have the target on your sights, well think again, this time you'll have to breath to stabilize the rifle, and if the target is moving you'll have to calculate the trajectory of the bullet, making it much more complex than Halo.
The level of customization in multiplayer is also one of the great improvements over other games of the genre, while not being able to make a model of your own, you can customize your weapon, which in my opinion is far better, and gives a better tactical sense in the battlefield.
Single player campaign is a bit short, but nonetheless it's a great campaign, the story may not be as original as you thought, but it's still enjoyable, and even more enjoyable thanks to the fact, that voice acting in this game is really outstanding.
All in all, if you like FPS this game is a must-have, you will remember it for years, and trust me, you won't be disappointed.