Gratuitous cheesecake reigns galore in Supergirl: Power, which should come as a surprise to no one, but if you can take that as simply the cost of doing business, this volume actually houses another competant Jeph Loeb mystery.
The questions left unanswered by Superman/Batman: Supergirl are answered handily here, and Loeb does a great job staying true to Supergirl's pre-crisis origin, while at the same time turning elements of it on their head, despite a somewhat quick, truncated ending after the mystery's solved.
This volume also serves as an interesting sequel to both Loeb's Superman/Batman: Public Enemies, as he handles - -is this a spoiler anymore? -- both Lex Luthor and some of Lex's old Public Enemies heroes team, and to Geoff Johns' Teen Titans/Outsiders: The Insiders, even if some of the continuity gets stretched a little bit (see the trade paperback timeline).
Too bad Loeb doesn't remain with the character any longer; we'll see next time around how Rucka, Kelly, and others handle her.