Share 'Mixing authenticity and entertainment…'

Westerns will always be my favorite movie genre, but, the problem I have is, the ones that I find entertaining, normally lack authenticity, and many of the ones that try to be realistic, I find very boring! (Examples: “The Assassination of Jesse James…”, “McCabe and Mrs. Miller”, “Heaven’s Gate”).  So, my question is what are some of your favorite movies that successfully mix realism and entertai…