A couple of years back, I played the first Dead Space game, and in atypical style (for me), I finished it. It was a great survival-horror/sci-fi adventure that was brought down a little by clunky movement, awkward zero-G action, and a story that had the lead character, Isaac Clark, basically bossed around the whole game doing everyone else's jobs. But it was still entertaining.
Earlier this year, I got the bug to go back and play the sequels. (At some point, I thought that playing all of a particular series of games would make for a good gaming goal this year.) Dead Space 2 fixed many of the movement and control issues of the first - objects were particularly difficult to position in #1. But, overall, I never really connected with the story. Isaac is "haunted" by the memory of his girlfriend who died on the Ishimura, and other than a final battle with her (sort of) she's not a threat at any time. Meanwhile, most of the exploration and combat takes place on a space station with generic hallways and room design. What I did like was the inclusion of more personality for Isaac and the addition of a new character, Ellie. She rescues Isaac at the end of Dead Space 2 and their relationship is a major part of Dead Space 3.
Dead Space 3 is a full-on, summer blockbuster, thrill ride! The design team at Visceral put a huge amount of effort into the game to make it as exciting as possible. You could tell that they wanted to surprise you with something new to do or overcome at every turn. Other than the combat sometimes, it never got repetitive. Add to that the ongoing situation between Isaac and Ellie (they threw in a love triangle as well), and it was a game I had to finish.
The DLC...well.... Ok, I had to play Awakened since it was basically an epilogue to the game, but at least I got it cheap. I sort of wish that it didn't exist though, because it's the last thing I'll remember most about playing Dead Space 3. It did little or nothing to extend the story other than to say that everything that Isaac did in the main game was worthless (ie, he didn't stop the Marker signal) and that the Earth, in the end, gets screwed anyway. Add in that a third of the gameplay takes place in reused sections of Dead Space 3, and you get a poor ending to a great series.