Quantum Theory for PlayStation 3 Reviews by Gamers

You basically go from room to more-or-less identical room hiding behind waist-high walls, shooting endless hordes of identical bad guys. There is no plot, no characters to speak of, and no reason it should be called "Quantum Theory". You need to be 100% precise, even with the grenade launcher, to do any damage. And, as 99% of your rounds will be misses, you run out of ammo pretty much instantly. Part of why you miss so much is that 1) you aim slower than any enemy can walk at a slow pace, much less sprint, and 2) you cannot hit ANY target if it is moving. It's like they borrowed an invincibility star from Super Mario Bros. that wears off whenever they hold still.
And if you get into a smaller-than-average room or corridor, God help you figure out what's actually going on as you face a brick wall while helplessly trying to get the camera to swing around and show you what's beating you to death from behind. I can handle swarms of alien cyborgs, but I cannot defeat The Dreaded Cameraman.
Add to this a complete lack of plot/exposition, totally cookie-cutter weapons, and a cover system that feels like it was designed by an autistic Martian, and you get this steaming pile of whatsit.
The graphics and slow-mo headshots are neat, but beyond this, there is nothing worthwhile about this game.