NYTimes isn't a source for those numbers. Read literally any reputable historian and they'll tell you it wasn't 10 million. Even the absolute hack moron Anne Applebaum will say it was less than half than that, and she's the most vocal genocide claimant in the field.
And Stalin took a backwards peasant country that lost to both Japan (1905) and Germany (1917) in quick succession, and turned it into an industrialized nuclear armed superpower that crushed both Germany and Japan (Manchuria campaign) in a single generation. Oh, they got help from the West? That diplomatic maneuvering to ensure said help didn't come out of nowhere, and something the Nazis weren't even capable of really doing with the Axis "alliance". How strong is the Axis if Stalin can get the Japanese to sign a nonagression pact with him, that they honour even as their "ally", Germany, goes to war with the Soviet Union? Diplomacy is a big part of warfare, and nobody played that better than Stalin.
Napoleon died a pathetic and broken man, exiled to a tiny Island because being a brilliant commander means jack shit if you turn everyone against you. Stalin died as the head of a massive Eurasian empire, winning the biggest war that was ever fought, and seeing his country through a whole industrial revolution in a tenth of the time other nations did. Was Stalin a good man? No way in hell. Was he a Great Man? Absolutely.