Stalin made the Russia a worlds superpower. Hitler lead Germany to a disaster. Pretty different things if you ask me. And as a Lithuanian I truly dont feel any love for Stalin, believe me But facts are facts: Stalin deserved to get in civ despite the terrible things he did. Hitler did not. He was just an idiot at the right time in the right place.
Still, Hitler made Germany a fearsome superpower that dominated the European continent and that required the entire world to unite against him to have Germany defeated. I think he deserves to be in.