Good overall, but underwhelming

Rating: 8/10 (21 July 2017)

I saw the movie in IMAX.
The genre earns this movie an extra star. Without the historical context, its a 7/10 movie.
The general consensus that the dialogue gets lost in the sound effects is correct. I don't mind loud movie sound effects when appropriate, but there was an almost continual low frequency drone throughout the movie, even when it wasn't clearly connected to engine noise, gun fire, etc. Strategic silence could have helped this movie. I believe an audio remix before release for home sales would help.
Acting was generally fair, but nothing special, overall. However, I did like Mark Rylance's performance.
Several scenes or events seemed less than historic and little more than obvious attempts at emotional triggers.
One very quick scene near the end appeared to be a special effects failure to me.
I do not expect to buy this movie, though I can see watching it again once it is widely available for streaming.