The Harry Potter films thrive amidst a select group of Teflon franchises– films that no matter their quality, earn huge openings and– regardless of any universal love– longtail their way to a tidy sum. And while the Potter films have never been terrible, their page to celluloid translations have always trended toward book-loyalty to a plodding fault. Eight years and five films later, Harry Potter’s cinematic legacy has finally birthed an entry that transcends its dedicated followers to deliver a …