Ahead of it's time.
Another fun thing about this game is the kill style, you can take people out with the silenced pistol or tear 'em up with the assault rifle. Although I prefer to sneak up from behind and grab them holding them so they can't move or do anything untill they tell you what you want to know, or you're done having fun with them. The interigation is also funny some quotes include:
"Pick a number between one and ten" and others of the sort, messing with the enemy phycologicly. Once the man you're holding has told you what you want to know you get the choice to either kill him or just knock him out. To kill him you either break his neck or kick him in the back breaking his spine, brutal yes. Or you can just block the blood going to his brain and knock him out for about an hour.
The enemy in this game is not the kind you can run past shooting and they don't see you. The enemy is VERY smart in this game, noticing an intruder by either seeing a body (which you get the choice to drag and hide) or even just a door you left open that they closed. I often hear "who left this door open?!" in this game and then the enemy is on the alert so I have to lean in the shadows against the wall untill they know there's no one in the room. Heh.
I highly recomend this game, it's addicting, fairly difficult so you don't beat it too fast, and has many missions. Also the gameplay and style is revolutionary. By now it's probobly at a decent price being the game came out years ago. Obviously this game was ahead of it's time.