It's based on Ian McEwan's novel, which I strongly recommend
But yeah, it's got X actor in it, so it must be terrible. Films don't have directors, producers, writers, or even other cast members.
Chock, the novel's narrative spans from 1935 to the middle of the war, so there's an case to be made (a weak one) for the "looming" comment.
Anyways, film websites are usually studio managed promo spots, and hardly indicative of the film itself.