Since 1984, when Tina Turner — following a 25-year career of shouting and shimmying her soul out — became an overnight sensation with ”What’s Love Got to Do With It,” she has produced only three studio albums. That?s scant basis for a compilation, so Simply the Best combines selections from those records with non-LP hits like ”We Don’t Need Another Heroe,” a creepy disco remake of Turner’s 1973 hit ”Nutbush City Limits” and three new tracks that demean her typically stirring vocals with lame material and sterile high-tech backing. Only ”River Deep-Mountain High,” the daring extravaganza produced by Phil Spector at the peak of his dramatic monomania and featured here as an incongruous historical ringer, supports Turner’s emotional strength with equally fervent music. C