I think Daniel Yergin put his finger on it with “The Prize.” You can’t wage much of a war without oil, Hitler hadn’t any, Russia did, so to Russia he went. His low opinion of Russians just helped him make a complete fool of himself.
Moreover, Russians can put up with a lot. They’ll eat dirt and sleep on ice, or eat nothing and stay awake longer than anybody. Adversity isn’t just the mother of invention, it’s the harsh psychonanny of the Russian.
And Hitler didn’t supply his troops adequately, because he thought it’d be a brief romp. Supply lines matter. Winter came, as it had for Napoleon.
Apparently the Germans didn’t understand about mud, and frozen equipment, and other practical concerns related to Russian weather.
Not to mention, Germans were invaders, Russians were defending the motherland, and a very big land it was.
So yes, Russian ruggedness wore out the German military machine. That and Hitler’s egomania.
After a while, without oil, all those planes and tanks were just so many very big paperweights.
Hitler also got sucked in by the Red Army’s problems in Finland, and figured they were a Paper Tiger.
An important factor in the Soviet Union’s victory over the Nazis was its oil production. Oil production which was made possible by Fred Koch who had built many refineries in the Soviet Union during the 1920s. The processes that Koch had developed were considered incompatible by western oil producers and so he sold them to the Soviet Union.
Ironically, it was as a result of Fred Koch’s experiences in the Soviet Union that he became an anti-communist.