it's all about violence.
MGS & Splinter Cell knock down or stun, or shot down their enemy. But ManHunt KILL the enemy with sadistic move. Just like the title: "ManHunt", you're playing to hunt down your enemies. one blow is enough to kill 'em.
The athmosphere is pretty intense. especially on later levels. the enemies (and the last boss) is really trying to hunt you down.
careful! this game is trying to make you a sadistic killer. if you hold down the mouse button, the longer you hold, the killing move is become more sadist (which I think it's pretty stupid). if you don't care how he kill, just 'tap' (click) and your enemy die faster. the game end faster. and you can continue to play other games.