Hitler, while maybe not a great person, was a great leader.
After World War I, Germany faced a massive debt because of war costs. To pay back debt, they kept printing money; they faced massive inflation and their economy was in ruins. This was a time when almost the entire world was in a depression. Hitler was just a part of the government, when he asked the chancellor, through a clause in the government, if he could rule for a few months because he felt he could do good. Once he was in power, he changed the rules and stayed as dictator. Under his "war machine", he brough back Germany from the depths of economic ruin, and by going to war, he brought he U.S. and the rest of Europe out of a depression. As a leader, his charisma and charm were uncanny; he had the ability to make anybody in his nation swoon. No man without some charisma could rally an entire country to hate one ethnicity. His military leadership was lacking, as he didn't trust his generals, but this has always been an issue, as many leaders who give power to their inferiors lose more than they gain. Hitler was an awful person, but as a leader, he had great ability. Besides, it's not like Germany faced too many issues, as they have the third best economy in the world right now, only 60 years after the end of World War II and only 15 years since the fall of the Berlin Wall.
Napoleon, who many count as one of the greatest leaders ever to rule, had the same issue. He only kept power for about 15 years; he expanded very quickly, and ulitmately, he lost by invading Russia just the same way as Hitler did. Before he ruled, France was always a world power; since he was dethroned, France has never been the same. He had a worse effect on his country than Hitler on his. His Continental system, which outlawed countries from trading with Britain backfired, as people hated him for stopping them from trading with their main commercial friend. He ruined their economy and left them below most of the other large countries in Europe. One major difference between him and Hitler is that his Napoleonic Code still forms the major parts of French society. Should Napoleon be in? Yes. He is the defining leader of the French. Should Hitler be in? Yes. He is the defining leader of the Germans. Hitler, in my opinion, should be in.