Some random observations:
Hitler killed the least popular people in Europe. He wan't the first or last jew killer just the most organized. There were dozens of pogroms throughout european history and it was frankly mainstream to consider Jews to be subhuman for around 1800.
Stalin killed Russians.
Hitler made Germany a stronger nation and helped it out of the crippling depression left by WWI and the sanctions.
Stalin destroyed the church, wrecked the economy, destroyed literature, harassed artists, neutered the professional classes.
Hitler fought his wars with general lawful warfare tactics (notwithstanding going on offense without provocation)(unlike the Allies who used their heavy bombers without discrimination, resulting in the fire tornadoes of Dresden and Hamburg)
Stalin let St. Petersburg slowly die. He stole Nuclear tech from the US and pushed the nuclear arms race that almost led to world annihilation. He used proxy armies and used forced migration of near asian peoples. He had the worlds largest prison camps and show trials
In the end the end they are both pathetic people. But Hitler was a product of the time. If he wasn't the jackass to start world was 2 it would have probably been another England vs France Battle or Spain. How Boring.
Stalin was the lead thief among uptight thieves, based upon a bankrupt interpretation of socialism. A petty little Georgian. Russia could have been the best country of the 20th century with all the Natural Resources and cultural geneity that the US wished it had in the 1950's. lol. Instead it's a permanent failed state reverting to strong man rule. Germany of course is and was a democracy.
So anyway, beware of over promising politicians in general and beware of people who think violence trumps ideas. The difference between Stalin and Isis is a difference of gods and success. They use the exact same tactics. It's really crazy.