It's a great game with suspense, action, and gore; by the way, the game WILL scare the crap out of you from time to time. I highly recommend you play this game, but first, I would recommend you picked up 'Dead Space 1'. You can get it for probably around $19.99, since it's been awhile since it was first released.
Dead Space 2 has a multiplayer mode; Dead Space 1 does not.
The game is offered on both the Xbox 360 and the PS3; however, the best system to play it on is the PS3. I won't go into detail as to why - but if you truly are curious, I can elaborate for you upon request.
This game definitely gets '5 Dog Paws' out of 5 from Husky Downs.
-HD-