Missing a story and its historical mystery

Rating: 4/10 (28 July 2017)

I so looked forward to seeing Dunkirk but sadly I concur with the negative reviews. I feel I must add my voice to counter the majority.
I want to add the following in addition to my main objection - the overblown incessant sound really hurt and prevented me from appreciating any of its parts.
The story of Dunkirk - how it came about and its evacuation are fascinating and historically intriguing but sadly none of this was brought out. Dunkirk did not provide context to the battle as it unfolded even confusing what little story there was with oddball editing, e.g., day and night times bounced around.
Dunkirk had a chance to explore why the Germans did not attack to fully destroy/capture the allied troops which by all accounts they could have fairly easily done. There was one reference in the movie when it was mentioned almost in passing that the the German tanks simply stopped their forward motion but nothing was said about why or even wonder why. I have read of possible reasons concerning Hitler's order not to destroy the expeditionary forces but now with the perspective of over 70 years this should have been included as the key missing piece of this story.
I gave Dunkirk a rating of 4 instead of 1 because of its visual production value but I am being generous.