For instance, can you accept that Adolf Hitler did in fact do some legitimate good for Germany?
Most of what good Hitler did for Germany was destroyed in the war. He also succeeded in signing away a significant portion of German territory and, on top of that, splitting the country in half for 45 years.
I suppose you could say he set the precedent for the Autobahn system.
Stalin and Mao brought third-world agrarian latrines to major industrialized world powers within 20 years of their taking of power. Despite all of the Cold War propaganda, you can't doubt that they also improved the quality of life for most of their citizens... I'd certainly rather live in the USSR than under the Czar.
Hitler, on the other hand, took a former superpower (in every sense of the word, scientifically, militarily, industrially) in financial crisis, and after a short rally destroyed it even more completely than it had been.
He certainly didn't compare well to his contemporaries.