It's one of those movies that thinks that being slow and quite makes it contemplative and artistic, but it's completely artless and inexpressive so it really jokes comes off as a massive bore. And the performances are all pretty lifeless.
Also, it thinks that it's making some statement about racism and reconciliation but it's handling of those issues is the same thing you get in countless 1950s westerns. And you know what else is old fashioned (and it got alot of criticism for this so I expected it going it)? The Indians are only the most broadly drown stereotypes. Really the difference between this movie and a 1950s western, aside from the fact that it casts real Indians, is just that it's long (at least by comparison), slow, sour, boring, shows more blood, has cussing, lacks the stable of character actors you get in old studio movies, and kills extra characters just to make it more downbeat.
There's no reason to watch it.