Ben-Hur is a very good if not the best epic in cinema history. The charcters are good, the story is real well written, and the message of the movie is also great. It is overall a very powerful film, and is Charlton Heston's best performance. I would venture to say that the ONLY two epics which compete with Ben-Hur are The Ten Commandments and The Lord of the Rings trilogy.
Even though Ben-Hur is most famous for being a film, it is actually a famous piece of literature. I have not read the book, but plan to, and I hear the novel is every bit as epic as the movie.