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I bumped you up to a 4.02, but I don't know how long thats going to stay.
This is one of those times when effort overcomes artwork. The length and story, be it slightly unoriginal, give this animation life over the art, witch is a little under par to be mixed in with some of the greats. If anything, just optimize your lines so that they fit more with the other art, an apply a single color shade to them. That would be enough alone to bring them up to standard in my eyes. Its not about visual complexity, but visual style, and your not far off.
I agree with some others that the DBZ type stuff was a little out of place, and actually detract from the experience. One would expect Awesome Snake or one of the other formidable characters to put up a bit more of a fight, but because you where using other's animation, its harder for you to do that. Because of this, it makes your less popular (compared to the greats once again) character seem a little beefed up and high and mighty for the job of taking on one of these guys.
If you ever where to re-do this, and re-animate all the stuff from the other animations in your own style, it would be even better, and no one could say a thing. Even if you are not nearly as good as the original animators, you'll get serious credit for the effort.
I'm glad to see the good use of music. Your choices, though a bit popular for my tastes, worked, and you timed the animation with the music much better than I have in my animations.
I hope the positive response you get from this keeps you animating. BTW, 8 is a high score for me to give ^_^