I managed to get through a playthrough on 'normal' without breaking a sweat. Only issues I had were on some UFO's the camera was an absolute PITA.
Having said that, shortly after completing the game all of my saved games were corrupted... so YMMV?
Playing ironman/classic lately and it's been ok.
Planetside 2: Wintermute/NC/Briggs | MWO: SyniK