Christopher Nolan’s Dunkirk has already been described as ‘a masterpiece’ and ‘a glorious, breathtakingly vivid triumph’, but we need to be cautious. Look at all the fuss about Baby Driver and what an average film that turned out to be. This certainly isn’t your regular war film — no one, for example, says ‘it’s quiet’ and is then told: ‘yes, too damned quiet…’ — but in wanting to deliver a visceral, visual experience, without the hindrance of exposition or back stories, the narrative is often confusing and doesn’t add up to much emotionally.