There’s a sublime awfulness and condescension to this American vision of Ireland, adapted by writer-director John Patrick Shanley from his Broadway stage hit: a mind-boggling stew of bizarre paddywhackery that makes John Ford’s The Quiet Man look like a documentary about crack dealers. Two of its stars, Emily Blunt and Christopher Walken – both playing Irish people – engage in a colossal intergenerational battle for who can do the worst Irish...