When musicians strike it rich, and thereby distance themselves from the concerns of 99% of their listeners, some view it as an artistic problem. Not Wiz Khalifa. "Mo' money, mo' Roberto Cavalli," is the Pittsburgh rapper's response on his fourth album, following up the break-out success of 2011's Rollin' Papers. You could pardon his glee if ONIFC represented a great artistic leap forward for the 25-year-old, but it doesn't – success seems to have dulled his considerable rapping talent. And that his enjoyment of wealth seems heightened by its exclusivity ("This ain't for them broke niggas," he warns us on Initiation) diminishes his charm even further.