When I look at a marine, i want them to be as detailed as posible ( Hot blonde marine winkidy winkidy wink). I hope this will happen. In the first look trailer it showed this with the face modeling.
Because when fighting aliens with bullets and plasma and explosions going off, how the standard red shirt Marine looks is totally important.
/sarcasm
I remember there was some hot blonde chick on a city level in reach, but i did a double take when i saw her.