VASTLY underrated
I seem to be in the minority, but I found this movie to be a delightful engagement of two acting powerhouses, each rising to the occasion above most of his previous work, playing off each other in a quite thrilling display which clearly parallels the giant presence of the historical figures they are portraying(*).
The kiddies won't appreciate the absence of literal pyrotechnics and improbable acrobatics and martial skills, but those possessed of a zest for life and an appreciation of character development will find figurative pyrotechnics here.
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(*) Even if it turns out in Josef Breuer's case that this is only inferred.