There's no doubt that many of Hitler's decisions indeed screwed the German war effort.

But after the war the German generals blamed Hitler for everything. One of the main examples they used was 'Zitadelle'. Now we know that even if Hitler made the ultimate decision himself, he didn't decide by his own considerations and discernment and made the choice with complete oposition of his generals.

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"War is less costly than servitude, the choice is always between Verdun and Dachau." - Jean Dutourd, French veteran of both world wars

"A mon fils: depuis que tes yeux sont fermes les miens n’ont cessé de pleurir." - Mère française, Verdun