I remember the 'Longest Day' quite vividly and being quite impressed with Sean Connery's portrayal of a Canadian soldier in the invasion of Normandy. Also remember 'The Battle of Britain' and 'Dam Busters' portraying actions in which Americans had no part. 'Sink The Bismarck' and 'Battle of the River Plate' comes to mind as well. When it comes to other battlefields, such as the Pacific, however, Americans were the main players and deserved top billing (indeed, Canada's deployment to Hong Kong was one of the most costly missteps in that campaign). I also thought that 'Saving Private Ryan' was the best war movie I'd ever seen. It depicted the horrors of combat in a way that would expunge the notion of glory from any sane person's mind. Overall, I'm not much worried by Hollywood's depiction of wartime events - it's usually good versus evil entertainment with increasingly impressive special effects.
For the record, I do regret that Cdr. Clouston's role was not included in 'Dunkirk'.