Gory and psychological horror meld together weirdly into an action formula. One that works, if not as good as it could.
As you advance through the story, the option to occupy the bodies of your team grows and so their special abilities; each one offers it's pros and contras but overall you could play as any of them almost as equally effective and rewarding, just depending your personal tastes. Would you rather slow time so that you can unpunishedly shoot at your targets while you circle them -maybe even throw the occasional grenade- or lure them to you only to be trapped by your blood ritual stopping them in their feet just enough so that you can close in and finish them off with your samurai sword?
The game is lengthy enough but, sadly, not polished enough. There is just enough variation on the combat -and you can help it by exploring with the several soldiers you get to control- and boss battles are barely above fine in terms of excitement and memorability but it's terribly lineal, and there aren't many real scares (as good as the atmosphere is) nor the mature rating is pushed as the game promises at times. Your team never dies truly, not in the gory fashion the monsters or us would like to, and you'll find yourself curing them often times so that the threat the enemies impose is not as palatable as could be.
However each detraction is understandable and has it's own coolness factor, like gameplay mechanics and emphasis on action.