Very true. Hitler made some incredible military blunders and singlehandedly lost the war to the Allies. The decision to invade the Soviet Union in June 1941 was especially horrendous. Up to that moment, Germany had total control of most of Europe and could have worn down Great Britain at leisure with blockades and by continuing the Blitz. Instead, they send four million troops into Russia and become increasingly bogged down as they quickly outran their supply lines.
This gave the Allies enough breathing space on the Western front to build their military on a colossal scale, which led to the mainland invasions of 1943 (Italy) and 1944 (France).
The Germans had world domination within their grasp but they threw it all away due to giving absolute power to a pin-headed corporal whose only strong point was the ability to give fiery speeches and mesmerize an audience.
Good thing the guy in charge here isn’t a pin-headed corporal, eh?
Following their defeat in Greece, the British hold on the eastern Mediterranean was shaky. Had the Germans pressed their luck in that region--say, invading Cyprus and then moving into Syria and Lebanon, where the French would probably not have resisted, they might have forced the British clear back to India and Kenya.
Another colossal blunder by Hitler was not keeping his mouth shut after Japan attacked Pearl Harbor. By going to war with the USSR, then the USA, Germany found itself at war with two continents as well as the British Empire.
Hitler had no choice but to attack Russia when he did...Stalin was busy beefing up the Red Army to attack the Germans by ‘43, so Hitler knew he had to hit while he still had something of an advantage....While I do not believe that either way Germany was going to prevail, at least attacking when he did gave them at least a fighting chance.
Now the prosecution of Barbarossa itself, is a whole other matter.