A rare find. 10 out 10 in my estimation. Apparently Flynn later in life wanted to be considered a talented actor rather than simply a ladies' man or "matinee idol". I think he was an excellent actor, a characterization borne out in his performance as Don Juan in this film.
The cinematography is brilliant, the dialog, though typical of films of this genre, is tongue-in-check and thereby hilarious as well as highly entertaining. The acting is superb across the board.
The film, true to the studio system protocols of the era, is stylized, but the stylization works brilliantly. I am certain that any contemporary aspiring director, writer or actor who is serious about his or her craft can learn an immense amount from this film.