Review: Young charmer Bruno Mars brings fresh energy to familiar styles during his brief but snapped-tight set. Too bad L.A.'s own Red Hot Chili Peppers crashed the stage. The question dominated much of the nonfootball-related chatter in the run-up to Sunday's Super Bowl: As the featured act of this year's halftime show, was Bruno Mars really up to the job of entertaining a television audience of approximately 100 million people? The answer, it turned out, was yes. But before he could prove it, Mars had to weather a storm of skepticism. He's only 28, decades younger than other artists who've...