Well that is what Churchil said.
The problem is that I see so much effort to present the Germans making 'mistakes' for losing to ridiculously overwhelming forces throughout the war when in fact we should be looking at the mistakes of the others who took so many casualties and delays against tiny forces. Mate, 1 million men with 25,000 vehicles and 15,000 aircraft managed to take a seaside town of Caen 10 km away from the beach on 16 July from a baby division only after carpet bombing the hell out it at night with 15,000 French citizen casualties and you call that what a triumph? A German mistake or plan? The plan was to take Caen on 6 of June. Anyway. Sorry, I can't buy that.
If you don't like those results how do you feel about the invasion and conquest of Crete?