I mentioned before that Beethoven didn't like him. I don't know how well the rule applies, but people who speak German and have long scruffy-looking hair tend to be much more agreeable than German speakers with very short hair or no hair at all.
If he had unified Europe, there wouldn't have been any world wars
There would also have been no Eurovision 1974 winning entry from ABBA. Go on - admit that you like it.
But ever-so-slightly more seriously, are these things amongst Napoleon's legacy:
The metric system is almost the only system of measurements used in Europe and consequently it is used throughout much of the known world.
Small man syndrome has a famous figurehead.
Napoleon Brandy.
La code de la route - Most of Europe's traffic passes on the right.
That second one is far less reliably associated with Boney as many countries changed sides long after he'd snuffed it.