If it's crap ... We'll tell you
I'd like to start this review by saying this... I am a huge fan of the Dead Space series and I adore the plot and pretty much everything else about it.
Dead Space 2 Severed can be bought on the Xbox Live Marketplace or Dead Space 2 store (at main menu) for 560 Microsoft points.
Severed starts you out as Gabe Weller, a Sprawl security officer who is in a Titan mine when an outbreak erupts. The protagonist of this expansion also has a wife, Lexine Murdoch, who he is trying to reach before Titan officers and other assholes do. The entire time that you make any conversation with Alexine is through your RIG while Titan officers monitor you. I've never played Dead Space: Extraction, but I am aware that this expansion does have some of the characters from Extraction so if you have played Extraction, you might want to buy this.(Gabe speaking to Alexine on his RIG)
A great thing about this expansion is the return of the twitcher. Sure it's an insanely annoying enemy from the original Dead Space but it does make the fighting more intense. Something else about this game is that it is only two chapters long and the areas that you go through in this game are not for the most part new. There are about two new locations in the game and then the rest is you pretty much going backwards through many of the locations in Dead Space 2 from about Chapter 8- Chapter 1, with the new locations in there for you to go to the areas closer to the beginning of Dead Space 2 faster. As you go backwards through the Dead Space 2 locations you realize that the places that Isaac recently explored have gotten much worse (such as the morgue area where many of the originally human dead bodies are now sleeping Necromorphs that when awoken, which they do awake, try and kill you.)
Since this expansion is so short you really don't get to care for this character much, until the ending. I won't spoil the ending, but I will say that this guy turns out to be very courageous and badass. I didn't see why the price for this was so low until I actually beat it after playing for an hour and a half. Where the shortness of the game is a negative there are still many good things about this expansion. The twitchers, new characters, some new locations, a new badass suit for Gabe, another great ending, and a protagonist with an accent are all things that make this game fun and exciting.
If I would have to rate this with the Spill crew's set of ratings I would have to give it a low Full Price because sure it is Dead Space but it is really short and the story is very similar to the Isaac/Nicole story from the original Dead Space. Then again it is 6 dollars which is a decent price for a game that's not very long.