Just from studying him for a few decades now,and this is just my opinion,but I think that man was brillaint politician and public speaker,but a very lax military leader. He came up with some great ideas early on,but he was a gambler. It seemed(at least to me)that in 1939-41 Hitler and Germany ran a tight ship,so to speak. The war was pretty much going their way and was calculated. But once Russia was invaded,then the Fuhrer just threw caution to the wind and made critical decisions without much thought. It was as if he almost knew that he would lose the war,even as early as late 41'. So he just said,"Screw it. I'm going all out then. I'm risking everything."