This game's story mode is tough. You take 3 enemy bullets, and you're probably dead, if not close to it. I found a way to give yourself an added edge over the enemies.
Have any of you while playing this game ever steadily kept aiming, while sidestepping into and out of cover? And I'm not talking about putting your back on the wall, I literally mean aiming, shooting, and then sidestepping slightly to put yourself back in cover again.
Well, while doing this, make sure that your aim is on the right side depending on what corner you're looking around I found out that if you get the angling right, you can actually shoot "around" the corner while still being in cover. There are many parts of the game where I can take my time and aim for headshots while having most if not all of my body covered. After doing this, I rarely ever find myself planting my back on the wall anymore.