Don't miss it! [Spoilers here]
I don't remember, honestly, there wasn't. Vicious visuals, astonishing game engine, and realistic voice acts. EA did it again, this game made a new standard for horror games.
After being recovered from the Ishimura Mining frigate, Isaac Clarke received therapy sessions to deal with the nightmares about his dead girlfriend; and his previous encounters with the marker and the aliens, Isaac suffered from a coma that lasted for 3 years, to witness the horrors again of the necromorphs, aliens that transform humans to viscous creatures in seconds. You don't know how the infestation spread in Titan colony, haunted by his dead girlfriend Nicole; Isaac must escape the Titan colony trying to figure out how the infestation began on Titan station, and live with the pain of his dead girlfriend.
The game engine is solid, excellent, the physics are realistic, and response speed is wild, it's the kind of games you "shoot with your head" rather than shooting with your gun. Game has some nice puzzles, tremendous interactive cut scenes and breath taking moments. Suspense and fear will keep you on the edge of your seat the whole time, you cannot rest, not for a moment, they come out from nowhere, from every corner, from every vent and window, they even show up in elevators.
The combat system/strategies are amazing, you can use your environment (Since the game is on a space colony, shooting windows will force the air to be sucked out, just before you get pulled as well, you shoot the emergency door buttons), furthermore, you can use your kinesis to throw pipes at the enemies that stab and cross them, you can as well freeze opponents, blow things right in their face.
Dead space 2 has new enemies, the "horde", which is basically a bunch of kids that scream like a little girl, run like hell to climb on you and tear you apart, and there were new ones, which I enjoyed very much playing with, creatures that hide behind corners and wait, till you show up, they would ram you with their horn, and hide again, playing with these sneaky ones is very tricky. Another one is a necromorph that pukes acid, very lethal in close range. You still have the original necromorphs, the babies with 3 tails, lurkers, pregnant necromorph, the one with an exploding hand, and the pure alien creature (which transform humans to necromorphs). Nonetheless, dismembering enemies is the most fun, gory and brutal thing in the whole game, you feel good about it every time.
The upgrading system is nice, really. You are free to upgrade all the weapons you like, and they are all lethal depending on how you handle them. The new suits are awesome, whole lot of different from the classic maintenance engineer suit.
Bottom line is, if you like the first dead space, you SHOULD NOT miss this. If you feel lazy of playing the first one, the game has a nice feature; a cinematic of the first game, explaining the story and events, and you can start right away.