I am not surprised given how much his assessment contradicted the "conventional wisdom". Nine out of ten times the convention wisdom became conventional because it was correct. Other historians (Keegan, Megaree, Glantz) are of one opinion; the Germans had slender hopes for conquering Russia at 1941. The Wehrmacht did not anticipate the level of resistance offered by the Russians. What other army in the world could suffer encirclements of Minsk, Smolensk, Umma and Kiev and still go on to win the war? The most interesting hypothesis I have read was posed by an old NATO warhorse: what if, the Germans captured Moscow and Stalin still not yield? Possibly Russia could invade Manchuria to acquire new sources of manpower and raw materials. Vital Russian industries had been successfully evacuated into Siberia; Russian internal lines of communication would be shortened, the German logistics extenuated. And to top it off, the Russians counterattack in Siberian winter.