"If Hitler had sent every single soldier used to that purpose to the Eastern front, I don't think that he would not have won or shorted a single battle or siege. He sent his best there and his best were worn down by Russian winters and wave upon wave of fresh Russian bodies and Allied material."

The stupid way he blindly wasted military resources, it would not have mattered how many resources were thrown into the cauldron. He stupidly refused to let experienced generals run battles in a rational way and look after their resources - he even wanted to destroy all Germany's infrastructure near the end 'to punish the German people for their failure' - he was a madman inexperienced in real military strategy and tactics, and cynically referred to by his own General Staff as 'that upstart Little Corporal'. That said, the amount of effort pigheadly expended in large scale murder - as well as refusing to feed the prisoners, or even let them work farms to grow their own food, did not help the German War effort in any material way.