I very much dislike "revisionist" history movies like Lee Daniels' The Butler....and I particularly am not interested in seeing a movie that tells me that one black butler was the one who raised the consciousness of every president he served under and was responsible for changing the course of history and policy.
It doesn't bother me so much in a film like Saving Mr Banks - because it's not world changing that P L Travers really hated the movie version of Mary Poppins....