"I got a lil' bit of thug in me," boasts Timbaland protégée Keri Hilson in the intro on her long-awaited debut. Lil' is the operative term: Hilson works up a sweat trying to come on like a hardboiled diva — promising to "get on my worst behavior" in the blippy single "Return the Favor" — but her precise, nimble R&B singing is a generic sound, carrying little menace or other...