Pretty good
I did not understand why they were shooting at each other in the beginning, but that is insignificant. This was quite good. I liked the style in which the characters were drawn.
However, I did not like the sounds from HL2 used, especially for the M4 carbine. That rifle should have a slightly deeper report, which is why I only gave you a 5 for sound. (It shouldn't sound like an MP7.) The guns were detailed quite nicely, nonetheless.
To the reviewer who was stating something about the "desert eagle firearm," I don't think that was not a Desert Eagle that the guy was firing. It looks more like a Beretta M92, standard sidearm of the US Army.