Bingo: the story of WW2 is that the Germans started with an effective army, and the Nazis ran it into the ground.

The saddest thing is subsequent decades of bizarre interpretations of this result because people got too excited about some effective German industry that they took Hitlers various wonder weapon attempts as planned engineering projects rather than engineers trying to put form to a mad man's rantings.

Hitler loved the idea of super heavy tanks, so the Germans kept trying to build them even though they were unreliable, ineffective and vulnerable.

Meanwhile the Sherman got a reputation for breaking down a lot...mostly because it kept surviving and being fixed in the field and continuing to provide effective armor support, whereas German tanks just died.