Hilarious
I first saw this so long ago, and it's nice to come back to it, especially now that I actually know something about Metal Gear Solid. The graphics and animation are high quality for their time (2005), and the voice quality is quite high.
The humor is also way better than almost anything being submitted today; the voice acting and the way the animation is shot really adds onto the humor, and the music makes everything much more dramatic. I also thoroughly enjoyed the face you gave the "OLIOLIO" guy. All in all, you did a great job with this. My only criticism is that the outline of Snake's face is just a plain parabola. Even for 2005, that's pretty weak.