I'm starting to get concerned about Jack O'Connell. First there was "Starred Up," in which he plays a violent prison inmate; then he starred in the two-hour beatdown-palooza that was "Unbroken." And now there's "'71," which doesn't even get five seconds in before it's punching O'Connell in the face and dragging him through mud. If he insists on essentially self-flagellating on screen, though, at least it's in the service of a quite good movie.