In reviewing Tina Turner’s L.A. concert last week, Ann Powers observed that the 68-year-old rock goddess’s singing just ain’t what it used to be. And she got walloped for it. (Samples of reader abuse are included.) “For many fans,” Powers writes, “just being in the presence of an elder artist confers residual magic… This takes us into the realm of pop music as religious ritual. Who are we to judge the gods and goddesses?”