lets not forget hitlers retarded no retreat law, since he thought they lost WW1 due to retreating too often and not being disciplined enough, he made it punishable to retreat in ww2, which lost lots of good men and removed a fair bit of tactics from play.
he was insane in a sense taht he thoought he knew what was best for the german army, his arrogance in not listening to his generals who have spent almost all of their lives in servitude really fucked over a lot of opportunities.