The lone survivor of a horrific alien infestation finds himself confronting a new nightmare. No one expects to come in contact with the marker without being affected. Battling dementia, hunted by the government who want to pry open the secrets he has, and haunted by visions of his dead girlfriend... Isaac will do whatever it takes to save himself.
What made Dead Space 2 a successful sequel, in my opinion, was that it built so well on the original formula. Not a whole lot was significantly changed except for the addition of multiplayer (which I have yet to try, as it is online only) and the revamping of the sequences without gravity (which they did a great job of, these were really cumbersome in the original). The Sprawl, where much of the game takes place, is full of very interesting environments, which I think the game really benefited from.
It has some new monsters and 2 new weapons.
And Isaac is no longer a silent protagonist.
However the game has faster pacing which may ruin the tension we loved from the original... and while the protagonist may speak, he as utterly bland and has nothing new to tell or show us. It seems that characterisation isn't Viscerals strong point.
Personally speaking its marginally better not to have a silent protagonist even if he's a uninteresting one (there are some exceptions like games that rely heavily on projecting yourself onto the character).
There is a hallucination aspect also but not much is done with it and the game lacks any real scares, beside the whole monster jumping out at you routine that American's mistakenly call horror. It makes you jump. But that's not horror.
Hacking mini-game is **** easy.
The ending does have some surprises though.