First of all, if the premise that Napoleon was a unique military leader is debatable, I would love to hear that discussion. I have a "pop" level knowledge of Napoleon and the time period.
Did Napoleon have better technology than his opponents? Did he have a unique way of seeing a battlefield or something? I've always heard he used artillery in a new way, but what does that mean? What did he do?
Not to discourage other answers, but you might enjoy /u/dandan_noodles excellent answer in this thread.
Hope that helps!