Easy, they are like two colors in contrast. Nothing shows off red like sand. If the first game was known for looking bloody, how do you get the attention? I guess you make it bloodier. There is blood everywhere. Apparently the human body is also a giant red paint can just waiting for you to wield a 9mm brush. The actual mutilation the game was known for is in no way muted down, but the blood has been really massively increased. There is a point of ridiculousness that is often reached in games, better known as the if some is good, more is better. I point to the bounce physics of DOA: Beach Volleyball 2, a secondary example of good gone so, so wrong.
As expected, and well executed, are the sound effects in the game. And as expected, the voiceovers have all of the range and diversity of static. I take that back, as that is a genre problem with FPS's that I am not sure they can be blamed for. Except, maybe, for continuing the stereotype.