For the first of two Film Club segments today, critics A.A. Dowd and Ignatiy Vishnevetsky discuss the jukebox musical Mamma Mia! Here We Go Again, a combination sequel and prequel to the 2008 box-office hit. Even with a new writer-director (The Best Exotic Marigold Hotel’s Ol Parker), Here We Go Again learns nothing from its predecessor, suffering from a lackadaisical plot, boring musical numbers, and Pierce Brosnan’s tone-deaf warble.