Overall an excellent single player experience that will keep you hooked and at the edge of your seat.
Sound: amazing sounds can be heard, from the plasma rounds being fired to the screams and scary noises coming from the other rooms and walls, at times when I heard them I was scared to continue, which is a great feeling in this type of game.
Presentation: the no HUD at first might throw you off, but you get used to it and wonder why we need them in games blocking are view, the menu interface, map items etc is done amazingly well. The environments and overall feeling of the game is perfect for providing scares from time to time, it really immerses you in the game.
Story: from what I seen so far it's good, it's one of those stories where you know nothing at the beginning (quick intro, not much back story) but little by little, it unravels into a spic story.
Game play: at first I thought the moment was a bit clunky, but you get used to it, the melee attacks could have been better, the aiming is great though and watching limb fly off is great :).
Conclusion: a game that for me at least came out of nowhere, I was not expecting or even following this game at all, with all the great titles coming out this year, good game can get lost but this one shines and it will go down as one of the better games this year.