Been playing this for the past couple of days and i have got to say, its a fantastic game. Control system is relatively simple and easy to use. Graphically, along with Gears 2, i would say this has some of the best graphics available for the Xbox 360, its clean and crisp and almost perfect.
As for the story it keeps you involved, and keeps you jumping. All the different styles of aliens/zombies that you meet and kill along the way mixes it up and makes you work harder to defeat them.
Weapons are fantastic and you will have loads of fun using them and blowing pretty much every limb off your enemies. Also it has a system called Stasis, where it allows you to slow down fast moving objects and also enemies. This can prove extremely helpful if your being attacked by multiple opponents but use its sparingly as it does run out.
Its quite a dark and gruesome game, which sometimes hinders it as it can be hard to notice things and take them in. If you love blowing limbs off then this will do you just right, and for £24.99 its certainly money well spent.