Bioshock - 9/10 - genuinely a great game. Immersion incarnate, the sense of desperation is instilled from the moment you sink into rapture and see your glimpses of a splice killing a civilian and it drives you forward through the rest of the game. Big Daddy fights, whether you kill them with and elaborate trap or try and take them out with a barrage of bullets it's epic.
Misses out on a ten due since I found most of the plasmids useful (essentially I only ever used Lightning, telekinesis and incinerate which all sound really powerful but you don't even have to buy them and given them automatically through the story) and hacking (although a clever addition) but done poorly. Even really easy to hack or you balls it up in like half a second.