I recently finished the game was well. Tried to go through it acting as an action hero would.
-Let the soldier go (for the moment.) 'Murica, and all that.
-Tried to save Gould. I figured that Walker would be foolish enough to think that he could manage to pull that off while still saving the civilians.
-Killed the snipers. After the WP incident, it made sense to me that Walker would be looking for revenge against Konrad, imaginary or otherwise.
-Shot Riggs. I felt dirty enough already without letting a man burn to death, even if he had set me up.
-Killed a few of the civilians. I thought that maybe I could push my way out, but that didn't work, so I decided that the game wasn't giving me a choice and shot one to scare them off. Only later did I consider the possibility of meleeing, or shooting the air. Whoops.
-Shot "Konrad." My reasoning for that was not that Walker blamed Konrad, but that even though he had been forced to acknowledge his crimes, Walker (being ever the optimist) didn't deem himself beyond redemption and thus didn't want to die.
-Surrendered to the evac team. Walker was past ready to leave.
Could have used a bit more fleshing out of the characters--the team dynamic, for instance, or Walkers history with Konrad. Overall though this is easily one of my favorite videogame stories of all time. Moral ambiguity, prominent character arcs, storytelling though gameplay, genre criticism, genre bending, genre parody, organic moral choice, leaning on the fourth wall, symbolism and foreshadowing out the wazoo, a decent (if admittedly derivative) ending twist, and a general mind screw...what's not to like? Personally I enjoyed the gameplay as well.