If you have never seen "Dances with Wolves," go watch it first, it is not great, but it is a better story.
Overall, the movie is equivalent to watching paint dry. The fact that Kevin Costner did not decide to finish the story he started in Yellowstone to do this thing tells you that it is all about his ego.
The storyline of Horizon is just one ridiculous cliche after another, for three hours. This is why, Part 2 has not been in theatres yet, there is no interest in ultra-long trash movie productions.
Costner has a love for Western-style movies, probably because Dances made him a household name. However, his insistence on this story being made clearly shows that he just likes playing a cowboy, but has no interest in telling a good story about one.
Some nice cinematography in many of the day shots.
The writing was poor and the acting was not any better.
A waste of every dollar spent on production.
A total disgrace to the Western genre.