It is on my list for the year. I understood the writers and directors took extra care to make it as accurate as possible in every way, from the story to the settings.
I make no claims for having deep knowledge of either the Civil War, or the South.
I did read a fact check about the film, and there seems to be no element of "rewriting history" or of "political correctness," in the story. A bit of theatrical license, creating "composite" characters.
My prediction: It will not do well at the box-office, since it is a serious adult subject, instead of childlike fantasy, which is the style of this day.