Hitler was a masterful crowd pleaser and manipulator....beyond that, he was a dumbass.
He figured he could order soldiers to not feeze to death during the Russian winter and laughed at the feasability of jets because they had no propellers. He also never figured out that many of his most valuable scientists and businessmen were
Jewish, he had either killed them or run them off as quickly as he could. The latter of which worked out pretty good for us.
Stalin was a coward. It wasn't until his generals managed to get him out of the way that the tide turned for the Red Army.
Regards,
Dave