In 'Brad's Status,' is Ben Stiller a loveable sad sack?

Our critics review “Brad’s Status,” which stars Ben Stiller as Brad, who has a midlife crisis as his son tries getting into Harvard; “Strong Island,” a Netflix documentary about the filmmaker’s brother who was killed in 1992; the Belgian film “The Unknown Girl;” and “Mother!,” starring Jennifer Lawrence and Javier Bardem as a married couple.