well its weird to say but honestly it lead to the early victories because of the belief that they were the best plus it lead to a unification of germany.
a counter argument would be that it was the down fall of germany because they became to cocky leading to the war on both fronts which ultimatly defeated them, but honestly it was only hitler that thought he could continue to take russia in winter leading to the down fall.
MY ANSWER
so i would say that the totalotarian state was the cause of early victories not defeat.
Well Germany's fascist state led to them becoming a force to be reckon with. After the First World War Germany was massive punished and Hitler managed to reverse this effect on Germany. He built its well known autobahn and re armed the country and even took over parts of Europe that belong to Germany before the war. Hitlers idea of the state being over the people was why Germany was a force to beckon with. He filled the people with the ideology of ethnonationalism where Germany belongs to Germans only. As we saw his country prosper better than any other European country at that time. The self pride in their country help fueled their victories in the beginning. Before the war started Hitler had already United what most of former Germany.