I agree with the one-star movie goers.. I too, looked forward to seeing Horizon and I like Costner's films. Horizon had way too many story lines, no names and it was written without much explaining. It was very hard to follow. I was really dissapointed. I have no problem sitting through a three hour film if it holds my interest. Sadly, this movie was slow in certain parts of the film and just lost my interest half way through.
Because Costner has so many fans, I'm sure he will do fine with his c+ movie. This is not on the same level as Dances with Wolves.