Roger Ebert reviews Leni Riefenstahl's Triumph of the Will in his "Great Movies" series, coming to the conclusion that it's not so great, at least in his usual sense:

It is a terrible film, paralyzingly dull, simpleminded, overlong and not even "manipulative," because it is too clumsy to manipulate anyone but a true believer. It is not a "great movie" in the sense that the other films in this group are great, but it is "great" in the reputation it has and the shadow it casts... I doubt that anyone not already a Nazi could be swayed by it.