First off, this is an experimental documentary. So it's likely that someone looking for the dumbed down, NatGeo-ish 'What Are Donkeys All About?' "documentary" may be disappointed. This movie has a unique way of presenting its story, and if you can cut the poetry a break, it does quite a good job of it. The movie uses long takes- a technique I really appreciate- and has its own pace and personality. I went in knowing very little about donkeys, and when it ended I practically wanted to adopt one.
Dafoe's voiceover is powerful and well read. The poetry can reach a bit too far at times (as was thoroughly dissected in other reviews) but if you just roll with it, the perspective you're granted is unique, substantive, and worth while. Even if the poetry was Shakespearean in its quality, the movie would still be quite the same experience. If you can attempt to understand what the directors have done, and turn of the armchair poetry critic inside your mind, there is a very beautiful film here.