But did he in general did anything that helped the world forward? Nope.

Sure, he did something for the economy, he even diminshed unemployment from 25% to 1%. But how? He put them all in the weaponindustry, a situation that would have lead to an economic timebomb (just look at the Sovjet-Union).

You also seem to forget that it wasn't the whole nation that stood behind him. In the 1933 elections, 42% voted for him. Needless to say many were forced to by the SS.

And after that, even during the war, far from all Germans supported him. Hitler didn't liked that, so the Gestapo searched all political opponents, and he put them in Auschwitz, .... Easy trick, if you ask me.

Plus, during the war, many people began to support him, because they were in war. They tought that they couldn't demand a pull-out for the troups, and that they couldn't stop supporting the Pres... I mean führer now the nation was in war.
Yep, extremely supportig somewhere can lead to dirty things, innit?

Edit: I just tought of another thing. Germany was very much punished after WWI, and the economy was dead. All Germans were very pissed, and frustrated. Any idiot could've stepped forward, and say "I'll fix all problems, just support me".
Then throw some extreme POV at the people, and because there were rough times, they accepted them without much thinking. Like "all Ara... I mean Jews are what's wrong in this world" and because they people were blind of anger, they accepted it.