The sequel to the 2008 schmaltzy smash “Mamma Mia!” features even more characters and more subplots and more romantic entanglements. But it’s also less entertaining, the stakes are lower, and despite its frantic energy, it goes absolutely nowhere. It has its moments, though, so if you want an empty summer escape — and have a fondness for ABBA — this’ll do. My mixed review, at RogerEbert.com.
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