While, for the most part, it looks pretty good. However after about the first minute or so it just turned almost too repetitive and became really hard to follow. Except for the build up, it's really just pure action with little time to pause and see what's going on.
I get it's an action piece and I really like the idea. I think you should limit your use of steadicam next time because it almost gives a nauseating feeling and, I don't know about you, but the last thing I want to do is feel sick to my stomach when watching something.
And if you're going to do a repeating shot, make sure to avoid lingering ones like the extreme closeup of the guy in the mask.
Looks really good though. BTW, what band was that playing? Metallica? Godsmack?