Much depends on your perspective and ultimate goals. At times you might need a strong leader to solves social issues. The Romans knew this and so they had a position called dictator under special circumstances. The ancient Greeks had this concept as well. As for Hitler, there is general consensus that he was evil. As for Mae Zedong, the jury is mixed. Some see him a a great hero, who allowed China to enter in the modern world, but other see him as oppressive. For instance, the cultural revolution was a scary time for many people.