Compared to "Saving Private Ryan", "A Bridge Too far" and other epic WWII films, this one rates a poor 4/10 on the scale. The Dunkirk evacuation was a feat second only to the D Day invasion for it's sheer scale and the number of people involved - 4000,000 plus.
A few lines of bedraggled, demoralized soldiers on the beach, a few warships, a few private vessels, a few Spits, Me109s, a couple of model He111s, Ju87s, etc.
A lot of CGI and a whole bunch of disjointed, unconnected incidents that don't add anything to the story. Poorly edited and most of the dialogue is unintelligible, especially between the RAF Spitfire pilots.
You will see the longest dead stick flight of a Spit during which the pilot shoots down a He111!!! Then it makes a hand cranked wheels down landing on the beach and is set afire by the pilot. While it burns, you see that the prop is held in place by a steel rod - no engine block!
I don't expect them to burn a real Spit, but today's movie goers expect more. CAS people get bent out of shape if a gun or tack is period incorrect in a movie. This movie was full of very amateurish portrayals and inadequacies.
Kenneth Brannagh, one of my favourite actors, mumbles unconvincingly through his pitiful lines and repeatedly addresses an Army Officer as "Colonel" when the man is wearing the three pips of a Captain.
This story deserves a whole lot more. It kept England in the war and made it possible for final victory.