Superb, piece of art!
The hybrids, the spiders, the worms, and of course the rumblers ... they are frightning ... really frightning. Just finnished this great game and scared me a lot ... Those sounds were terrifying. But where is the thrill in a game, if you're not afraid to look what's behind a door or a wall? What a rush of adrenaline runs your veins when you find yourself in a room with monsters and your weapon jams, or you run out of ammo.
Great game ... Waiting for System shock 3 (BioShock ???)