Usher’s blazing Super Bowl halftime show performance was many things Sunday night: Flashy, flirty, fun — a Vegas-in-space, galactic-glam spectacle for the ages that somehow involved roller skates. But most of all the thrill and propulsion of Usher’s halftime setlist was overdue. Sure, pop fans deflated a bit when it was confirmed Taylor Swift — seemingly revved and ready, in mid-season Eras Tour form — would not be playing the largest stage on Earth (again) in favor of a bygone star who hasn’t produced a major hit in over a decade. Truly, Usher should’ve been given his own halftime show back t…