A lot of people found this excessively difficult. I for one beat this on my first try using a track pad instead of a mouse (which is tough for fps games) and never got below 60% or so. One thing that I found detracted from gameplay is that I found the grenade launcher before I found at least 3 previous weapons, meaning that there was nowhere to go from there. I also thought that the combat scenes made little sense since we were supposedly moving around. Why were we always fighting in the same field?
I wanted more variety, but overall the gameplay is very smooth and the graphics are excellent. Very deserving of first page. While it seemed like an exact copy of Last Stand , I enjoyed the more realistic first person perspective.
My BIGGEST GRIPE however, is that after all that drama and suspense I got nothing but a crappy congratulations screen saying that the army saved me. I want an animation showing some gore and whatnot, or at least more descriptive text. Make the ending more cathartic.