The song feels like the intro to a stealth movie that they would play during the opening credits or something. I feel like you could have given it a little more "umph" though.
That is, your idea and aim here is very well refined and you know exactly what you were doing. The only problem is that it seems to lack a little something from time to time. Around :54 for instance, the brass could have been a little louder. I know that this was the fall out of the song, but the lack of orchestra combined with the melody here is enough evidence for that.
Also, at the 1:20 area when you are building up: if you're going to build up to such an impact go all out man. I need some percussion! Timpani, cymbals, bass drum rolls! Give me some boom! The impact here could have just been more dynamic. After the build up you could of had a full section of excitement and tension, but instead you dropped right off. Again, I know that the feel of this song is kind of "sneaky", but stealth can be exciting too. Then you could have dropped back off after the short impact section.
I just found an awesome example of what I am talking about. Look up "Splinter cell theme" on youtube. Go to the first hit, called "splinter cell double agent original music."It's almost a direct parallel to your song, but with the section I was talking about. It's even at the same time of the song.
Anyway, it sounds like I'm just complaining a lot, but really I gave you an 8. That's because the song itself is all here, you just didn't put together a few elements in my mind. Maybe you couldn't find the right sound samples or something, but there is no way I could know that.
Good work! I voted 5 because this certainly deserves better than it has. It really gets a 4 from me though. :)
Keep it up!