Game Chronicles says:
There is no conceivable circumstance where I could or would recommend Quantum Theory. It is not a good game. It’s desire to be Gears of War is admirable in a creepy stalker sort of way, but it really misses dozens of marks at every turn. The graphics are incredibly dated, the story is non-existent, character development is right out the door, but I will say this about Quantum Theory: it is functional.