The final fight is probably the most anti-climatic fight ever in cinema
First of all, we are led to believe that Xao is virtually untouchable thanks to his advanced cybernetics. We are also led to believe that O'Brien is beatable because of that pathetic fight between him and the old geezer Bradford.
Immediately as soon as the final fight begins, it becomes obvious that Xao is definitely not untouchable, O'Brien makes him look like a bum. Uh, couldn't they make the fight closer, more enjoyable, I mean at least let Xao hit O'Brien once?