People owe it to themselves to play this game if they're a fan of the Resi series or sci-fi horror in general.
The whole feel and atmosphere of Dead Space had me on edge throughout my entire play time, which for me is the mark of a good horror game. I was never quite at ease while playing it, just waiting for something to happen.
The sound design didn't exactly help my nerves. You're always hearing movement around you, through vents and air ducts. In the far reaches of the ship, you'll hear enemies and humans alike moaning and groaning. Dead Space does rely on BOO moments here and there, but they're done very well while not relying on them so much.
Weapons are extremely satisfying to use. They stand out as a highlight, and are rather revolutionary in a way - being that they're industrial tools rather than full on military hardware. Having no HUD is genius - all your information is displayed on floating screens infront of Issac, be it videos, inventory, audio files being played and pickups.
Rating - 9/10.