This is no spoiler review, spoilers and historic movies, how come? ;)
It was like a theater play in movie theater, no visual effects, waste of IMAX. Main story is political power struggles, boring for most.
Dramatization was mostly by music and some basic symbolism. Interstellar, Dunkirk was something else. At least expected something like Oliver Stone’s JFK or 12 Angry Men, but not even close. I can’t blame those left in first half.