The fact that it doesn't need a guitar controller *also* makes me rather happy.
The fact that I don't actually know most of the songs makes me less happy. No Carry on, Wayward Son or Freebird (although were they Guitar Hero rather than Rock Band? Can't remember. Mind you, there's a version of that for iPhone. *g*). But Hanging on the Telephone is there, and the Steve Miller Band's Take the Money and Run is a bit of a grower.