I have written about the Great Dictator and Nazi Germany resp. post -war Germany here and as described there it's very likely that Hitler never saw the movie despite all the rumors that he did and maybe even liked it – he requested it twice to be shown for him but apparently they never could get their hands on a print...). The only organized German audience that saw the movie before 1946 was most likely a unit of Wehrmacht troops in Yugoslavia in 1943 – Yugoslav Partisans had amanged to inflitrate one of the Wehrmacht's mobile cinemas and had exchanged one of their propaganda movies for print they had received as part of a British-US airdrop to support the Partisans. Reactions of the Wehrmacht troops ranged from roaring laugther to threatening to shoot the projectionist who had no idea what was going on.