Bob, I just saw it 2 nights ago. It's very good as a biography of Salgado, explains some of his motivations and shows him on some of his long excursions. Large parts are very gruesome, with pictures of starving, dispossessed people and bloated corpses, but ends on a high note with the Genesis project, full of reaffirmation. Slightly hagiographic, almost like a vanity published book, because it's co-directed and/or co-produced by his son.
I don't think it's a Must See, but it's a good movie. Of course his photographs are very beautiful.