I really liked the game, though it could have been better. There were a few things that annoyed me, like how static the environment was. There were many objects that were evidently made of indestructible super material, and bolted to the walls or floors by similar super material bolts).
Some of the monsters get a little repetitious, but at the same time no less frightening. In a way I was almost lulled into a sense of confidence after the fifth one, and then was promptly attacked from behind, by one of the monsters I though would be easy to beat.
It is however, one of my favorite games. More so than most games I have played Dead Space forces the player into the world and mentality of the game. I recall being surprised at my own paranoia after I shot at a monster that was dead lying on the ground, which the game had trained me into by making monsters feint death (I still shot him a few times to be sure).
Buy this game, turn your lights off, and turn the volume up. It is an exciting emotional experience to play this game as it was meant to be played.