The Rocker has found its beat. According to the first two official reviews (I have seen), the comedy has all the right stuff to bring audiences to theaters for something that isn't acronymed to TDK.
Variety
While Rainn Wilson handles cubicle work with aplomb on TV's "The Office," he's also right at home onstage in "The Rocker," playing a heavy-metal burnout who gets a second shot at stardom -- never mind that success comes 20 years too late, drumming at his nephew's high school prom. It's the kind of role ready-made for Jack Black (had "School of Rock" not happened), and Wilson makes the most of it in this well-crafted, feel-good satire. With a gradual rollout -- and the right word of mouth -- Fox could have a modest hit with the Aug. 20 release.
Hollywood Reporter
The off-kilter comic rhythms of Rainn Wilson are exploited to excellent effect in "The Rocker," a derivative rock satire that is far more enjoyable than one would have a right to expect. This tale of a middle-aged drummer getting a second chance at stardom overcomes its essential familiarity thanks to a frequently witty script, grounded direction (by Peter Cattaneo, of "Full Monty" fame) and an engaging turn by its star that proves him more than capable of carrying a comedy feature.
Check out both the reviews for The Rocker by clicking the bold links above.