Where the movie went wrong...*spoilers*
When they brought romance into it. That totally screwed up the last half of the movie. There was no build up to it and it was hard to suspend my belief.
Wolfschtagg deserves a better death than the cop-out death he got. He was one of the best characters (along with James Hong) in the movie and they totally screwed him over. And why did he died the way he did...because of the romance subplot. Such a shame...they totally mishandled such a cool villain.
The other part the killed the movie...the silly ping pong battle in the forest, then the bridge. Such a crappy showdown.