Hitler is still pretty fucking high on the list, but I fully agree that Stalin was on a different plain of evil. You know I love me some history, Russian history included. Replace Aryan with Slavic and you pretty much have a similar picture with Stalin's period too. Except the non-Slavs where mostly accused of collaborating with Germans and exiled to Siberia, that or your friendly rural gulags.
I just about went and wrote up another paragraph lol, but I'll say the world would have been a much better place had the White Russians (the anti-communist remnants of the Russian Empire) won the civil war after WW1. No communist repression and murder across Eastern Europe, no communist China (Mao got as far as he did with some serious Soviet aid), no powerful communist parties that nearly took over Germany before Hitler's rise to power. The fear of a communist Germany is what really helped the nazi party gain legitimate power.