Well i've finally finished the game. A little disappointing i must say. At times, it was unbelievably great, then again, sometimes it just plain stunk. All the sci-fi really ruined it if you ask me. But overall, it was an interesting experience.
The good: Graphics, sound, level design
The bad: Story, weapons
Gameplay: 8/10
Graphics: 9/10
Sound: 8/10
Story: 5/10
Overall: 7.5/10
One last thing, the two missions that required the player to remain undetected were amazing. I played them both several times - i can't get enough of them. They are the reason i give this game 8/10 for gameplay, otherwise it would probably be a weak 7.