Hitler´s Mismanagement
 

I agree with you entirely ReM, Hitler´s micromanagement of the war was a godsend for the Allies when you compare it to Stalin who although totally paranoid nevertheless gave his generals free-hand after 1942 and allowed them to reverse the tide.But At the same time without Hitler pushing Germany into a war there would not have been a two-front war and the tens of millions of casualties as nobody in Germany had the charisma or appeal that he had.

Speaking of stupoid decisions that he made you can add coming to the rescue of Mussolini in North Afrika and Greece in 1941 which cost a fatal delay to Unternehmen Barbarossa and tied up /bogged down German forces in Lybia and the Balkans instead of being used against the Soviets or British somewhere else...

The North African theatre perhaps? A little more commitment might have tipped the scales there. Or what to think of the planned capture of Malta? If the German had seized Malta their convoys in the Med probably woud've reached Rommel, giving him access to the supplies that he so sorely lacked.

Some people state that Barbarossa could not have taken place earlier than it did because the ground in Russia was too soggy after an exceptionally wet spring. Don't know if there is any truth in it though. Fact is that panzers that were needed in Barbarossa had to be brought up all way from the Peloponnese; the wear and tear certainly not doing them any good.