Reliance on instinct
Whatever the problems with his generals, however, there is no doubt that Hitler lacked many of the qualities he needed to control military affairs with consistent success. There have been examples - Churchill was one - of political leaders who successfully interceded in the details of military strategy and operations, but Hitler had neither the experience nor the personality for such a role. He shunned serious, comprehensive intellectual effort and was largely ignorant of military affairs and foreign cultures. He tended to reject any information that did not fit with his (often wildly inaccurate) preconceptions. Instead he relied on his 'instinct' and a belief that the will to win would overcome every obstacle in the end.
His talents - or lack thereof - aside, Hitler took the practice of personal command much too far. No military leader can hope to understand the realities of the situation on the ground from hundreds of miles away, and yet he came to believe that he could control all but the smallest units at the front. At the end of 1942, for example, during the battle of Stalingrad, he actually had a street map of the city spread out before him so that he could follow the fighting, block by block.
Similarly, near the end of the war he ordered that no unit could move without his express permission, and he demanded lengthy reports on every armoured vehicle and position that his forces lost. Such methods guaranteed that opportunities and dangers alike would go unnoticed, that good commanders would be trapped in impossible situations and bad ones allowed to avoid responsibility.
Hitler also combined his insistence on personal control with a leadership style that often consisted of equal parts indecisiveness and stubbornness. He sometimes put off difficult decisions for weeks, especially as the military situation grew worse. In 1943, for instance, his inability to make up his mind about an attack at Kursk eventually pushed the attack back from April to July - by which time the Soviets were well prepared.
Arguments among his commanders and advisors did not help the situation. By late 1942 Hitler's subordinates had split into cliques that competed for increasingly scarce resources, while he remained the final arbiter of all disputes. His senior commanders felt free to contact him directly; they knew that the last man to brief him often got what he wanted. At other times, though, Hitler would cling to a decision stubbornly, regardless of its merits. His decision to attack in the Ardennes in 1944 is one good example: his commanders tried, both directly and indirectly, to persuade him to adopt a more realistic plan, without success.