@The screenshots with guns: It is very common to put much more detail into weapons/hands/arms of the main character in a first-person shooter. No one else (not even their guns, until you pick them up) would have that much detail.

@The screenshots with people: Yes, their faces are high-poly. But look at their arms and hands, and you see that while they look good, you can still see their sharp edges. It is also very common practice to put a lot more detail into the face/head than the rest of the character, as that's where details get noticed the most in a first-person shooter.

The lower LoD levels (if they do it effectively) would even out the details between the face and the body, since with lower LoD levels you don't see the face close-up.

Jibb