Add in that many many Germans worked for the Allies and risked their lives to provide intelligence. There were many good Germans after all.

The USSR in particular knew far in advance of Front Line German troops the High Command's battle plans.

The German defeat at the Battle of Kursk, considered by many to be the main turning point in the war, is one such example.

see:

'Unfortunately for the Germans, their plan for the Kursk salient was known to the Soviets, both because of the military logic, and because of intelligence gathered on the ground and from spies. As early as the end of March the location of the attack was known."