Marx and Engels were philosophers, not statesmen. Nietzsche is there but Hitler took alot of influence from him. Nietzsche was to Hitler what Marx was to Stalin.

Hitler was financed by people who opposed the ideas by Max and Engels. People in Germany largely hate Hitler. Stalin did some horrible things primarily to Russians, but people in Russia to this day love Stalin. Same thing with Mao

There's plenty of people who either (claim to) love Hitler or who - according to the media at least - are ardent followers of his philosophies (for lack of a better term) as well so in that respect he's right up there together with the others.