Napoleon was a complete failure, never mind Waterloo.
Napoleon eventually lost a war against overwhelming odds when the entire rest of Europe turned on him.
I fail to see how this qualifies him as a complete failure. Unless you consider RE Lee to be “a complete failure” because he was eventually defeated by overwhelming force.
Napoleon was perhaps the greatest general and strategist of all time. Probably would have set up an empire over all Europe if not for the existence of that pesky English Channel. And of course his apparent inability to get beyond French chauvinism which eventually encouraged the growth of nationalism in the subject peoples and the disintegration of his empire.