This game is ridiculous, and the worst game I have bought in all my gaming years...
I'm afraid to report that this game is completely and utterly rubbish, even though I wanted and expected it to be a lot better. Its faults seem to be never ending, but I'm going to list a few anyway:
1) The sense of the enemies are super-human, and seem to notice you from miles away, and can hit you with their weapons from any range they like.
2) However, when you are using the M4 rifle whilst playing as the Delta Force, it is stupidly inaccurate, and chews up ammunition they it's going out of fashion.
3) The Health system is rubbish. You have to constantly inject yourselves with adrenaline, and can chew up your whole stock of needles if one fire fight, as the enemies seem to be able to shoot you even if you are behind solid cover.
There are many more, but at the end of the day, the game is behind on its time, and nothing like the Modern and Popular FPS's.
It's only fall back is that is is an easy score for achievements if you buy the xbox version, and if you can get it for under £15, it would probably make up for some of its mistakes.