I saw the documentary and like someone else I talked to, I thought it was "artful but skimpy on content". It was very tasteful in style and I think an easy introduction to Buddhism, particularly to people who know nothing at all about it. But, it did lack a lot of details.
The emphasis on poetry and authors, I think, was that they wanted to focus on the Buddha's life as a narrative- not so much on historicity and scholarship. In an interview the director, I read that he wanted to personalize the film for the audience by using the Buddha's life as example of his teachings.
I was hoping for a documentary of more substance, but alas it was not to be!