By Jody Rosen
September 25, 2012
You can measure a singer's place in the pop-star pecking order by the quality of the Max Martin/Shellback song she releases. For Xtina, the news ain't good. "Your Body" is a sluggish and nearly hookless hookup anthem, apparently dredged from that part of the Stockholm harbor where the Swedish hitmakers toss their D-list material.