Napoleon was not overrated. I read his biography. He may have been the most competent man on the planet, ever.
MLK is definitely overrated. Many universities no longer observe President’s day, but the all observe MLK day.
He had an Obama complex.
Eygpt, Russia, Waterloo. Three times he expected to win because it was his destiny, and didn't take into account local factors - supply lines, weather, competant opponents.