I saw this last night with my best friend, who also happens to be Potawatomi.  We both found it a profoundly moving and very sad movie, for all the reasons Sister mentions above.  My friend also noted that his biggest issue with the film was that the "hero" of the movie is a white man, that the Indians still need to be taken care of by the white man.   It is a movie that I will need to watch again and again.  Sadness, despair, sorrow and pain, the lot of way too many of our native peoples.