Gargantuanly mindless film masquerading as a complex, time-spiraling conundrum. One weak idea – stuff going backwards – to hang the whole miserable plot on. Unwatchable to the point of making me want to find that algorithm, go back in time (or would it be forward - oh really, who cares??), and make sure this film never gets made. A total waste of human energy, time and resources. If ever there were a sign of 21st century civilisation disintegrating into meaninglessness, confusion, and alienation, this is it.