They no doubt wanted to take advantage of the Xbox 360's lighting and reflective surface features. They just applied all of the reflective surfaces to the blood and guts, and voila. The darkness is so profuse that enemies just look like jumbled masses of incoherent bits, and then they dress your team up the same way. Everyone and everything is just black. I fully understand this is a dark and black game, but even DOOM III, where the whole game was pitch black except for your pin light, had color to it. Unless you can decipher 10,000 hues between black and grey, then that's all your really gonna see - black and grey. Oh, well, excuse me, except for the bright, red entrails everywhere.
Sound in this game is going to get you killed more than anything else. If you can't instantly pick the mostly dark bad guys out of the mostly dark background visually, then some spacial sound would be nice. You can forget about that. Any time there is a monster attack, the sound is exactly the same all around you. If you think that this is an impressive feature, you know, like "there coming from everywhere!", than you are just wrong. It is just plain lazy. Now with that, I have to pay respect to the large amount of dialogue in the game. I didn't say great dialogue, but at least it went off when it was supposed to and applied to the situation. You didn't spend a particularly long time without someone speaking to you. I would even go as far as to tip my hat to some really great mood and mission dialogue.