A preview to what?
Much too short, and you need a better story than pirates (!) flying around and blasting each other with Final Flash.
Graphics - Decent animation, poor visuals
Style - Nice tempo, fast-paced from start to finish with no slowdown
Sound - One song, no sound effects? At least no one's yelling, "Kamehameha!!!"
Violence - Pretty violent for such a short flick
Interactivity - Press play and it's over, pretty much
Humor - Nope (DBZ pirates aren't as funny as they sound)
You can do better for your next one, keep trying