Just read the critics in my post ! Everything is there.
Visceral laid the foundation for a terrific horror series with the first Dead Space. The clean, HUD-less presentation, dismemberment-focused gunplay, and expertly crafted derelicts have made each successive entry feel ahead of its time. Dead Space 3 evolves the winning formula into a title not only befitting of the fantastic series, but also one of the best games of this generation.
Gaming Nexus - 9.5/10
Dead Space 3 capitalizes on everything that made its predecessors great, and expertly executes everything new. It has the psychological scares and claustrophobic environments of the first two games, but proves they aren't the only ingredients for a tense experience, adding vast expanses that alter both the mood and gameplay. The whole experience blends a plethora of disparate parts into one cohesive whole that ends the trilogy as well as anyone could expect from Visceral Games. It's been a long, harrowing journey for Isaac Clarke, and I'm glad to have seen him through it, and eager to trek it again.
Polygon - 9.5/10
Dead Space 3 is a monster of a game. Visceral avoided major deviations from the gameplay loop established by the previous games, instead choosing to refine those mechanics. But it has made major, substantive additions to the game's structure that make Dead Space 3 feel much more ambitious. Even more surprisingly, it has successfully executed on all of them. Visceral hasn't just avoided screwing up its game with co-op - it has made it feel natural and at home, and has done it without impacting the single-player experience in any negative way. That alone would be enough to make Dead Space 3 an achievement. But the new crafting system and bigger, more open level structure join co-op to make Dead Space 3 one of the best action games in years.
Gamers' Temple - 93/100
All of the horror atmosphere that was in the past games is all still in Dead Space 3 and the game is still very much a single player campaign, or you can play it in its optional co-op campaign to see the story with some additional insight on John Carver's character. Dead Space 3 is one action horror game that knows how to include co-op and not limit the single player experience!
Joystiq.com - 4.5/5
Dead Space 3 is an exciting, shocking and mammoth adventure through the ghostly, unvarnished segments of space – and you do, thankfully, get to spend some more time flying. There aren't many games that can match the lonely, liberating movements of Isaac Clarke in nullified gravity, or his vengeful, squishy stomps of victory.