Stalin nearly lost the war in 1941. His forces were reeling, his orders had placed many of the Soviet forces and air units too far forward and relied too much on Germany being occupied through the beginning of 1942, and his issue of military orders making unauthorized retreat a punishable offense hampered an already chaotic tactical situation.
On the other hand, his harsh attitude DID stiffen Soviet resolve. After all, while they knew they risked death fighting the Wehrmact, they were reasonably certain that Stalin would have them and their families killed if they didn't fight. Not very "sportsmanlike" of Uncle Joe, but Joe wasn't much for subtlety when facing down the opposition. Just "axe" Trotsky.
Fortunately for the CCCP, Hitler lost his nerve during Barbarossa and held up the panzers. Had he given them free reign, it is considered likely by some that they WOULD have reached Moscow prior to the onset of the worst of the wet weather. With that hub torn out of the Soviet Union, the Soviet Army's ability to turn things around would certainly have been slowed.
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