This was pretty good.
The whole thing was a little cliche for my tastes, and I have seen work alot better than this, but I can tell you put some serious effort into this, and I commend you for that.
Again, O Fortuna is a little over-used (though I can't say that I've never used cliche music) but I'm glad you put the latin at the beginning, even though it did go by rather quickly, not giving the viewer enough time to read it (or maybe it was just my computer), I thank you for that because it shows that you actually took the piece of music you were using seriously, and not just because it sounded intense.
The graphics were decent, the eyes and the faces were a little iffy, but the 3D effects were great (the blood spatter was well done and the camera move around the extended arm was brilliantly done).
Yes, there's the whole bullet casing error, but it didn't make much difference unless you're a real stickler for things like that (which I usually am, but in this case it didn't bother me that much).
Just to explain my scoring...
GRAPHICS: 7 - The drawings were not the greatest, but the character movements were well animated. At least they weren't stick figures. That drives me absolutely insane.
STYLE: 5 - Not the most original work I've seen. Gun battles and fight sequences that aren't part of a larger body of work are nothing special now.
SOUND: 7 - Good choice of music. Slightly over-used, but you took this music somewhat more seriously, so you gained back points for that. No sound effects, which was a good choice.
VIOLENCE: 10 - I'm not one of those guys that likes a big gory bloodbath, so the amount of violence and blood in this was a good balance in my opinion.
INTERACTIVITY: 0 - There was none, but you don't lose marks for not having any.
HUMOUR: 0 - I don't think this was supposed to be funny at all, and it wasn't, so that's good.
7/10
Well Done.