If you want a Demo Dick audiobook read by Mickey Rourke, this is for you. Otherwise forget it.
On with the review:
No realism on any level. No matter whether you sneak or charge. Knife kill cutscenes, while cute, have no logical connection whatsoever to where you are in relation to the victim when you initiate the kill. You might be crouching behind someone, you press the button and voilá, you are miraculously attacking them from the front (no, they do not turn around first). And so on. Definitely not worth its price.