His domestic policies were imperialistic,very reactionary and anti working class. His leadership was swiftly rejected, with barely a second thought, when the conflict ended.
What surprised me and what made the film's premise dubious was that in my quite extensive reading about the two wars, I've only come across passing mention of his fear that Overlord would end up like the Gallipolli campaign. Here it was the heart of the film and drawn out in a quite tortuous way, making him into a very unsympathetic, tantrum prone crybaby.
Sounds familiar.