The game had alot of potential, but there were many things that didn't quite get it there. If you own a PC and you brought this game to try out, you will understand straight away that the game was made specifically for consoles. The firing cursor is too big, and there is no way to change it. There are also certain features in the game that were a good idea, but wasn't developed further, for example the sprinting in the game is useful, but they programed it so you only ran straight, and you couldn't shoot at the sametime.
If I am not mistaken the game is actually using the Unreal 2 engine. The graphics in the game is by far one of the best I have seen, (but you do need a reasonable high spec computer to see it), I would say it is on par with games like “The Chronicles of Riddick: Escape from Butcher Bay”, “Unreal 2”, and even with some of the newer games of today. There are also features like crumbling pillars when you shoot at them, or things fall apart like guard plates on fences, which is a very nice touch, sort of like F.E.A.R but toned down. The weapons are also quite unique, especially the way they reload, but you will end up finding one dominant gun, and saving ammo of the more powerful guns for bosses.
Overall its not too bad, it has high potential but its just missing certain things that make other FPS great. For the price its at now, it is good to give it a try, and if you are just looking for a good wholesome FPS to waste time on, this would be the one.