If I'm not mistaken STDiva plays a musical instrument. He posted up a pretty beast cover of Good Vibrations one time.
Anyway, yeah the guitar hero argument is pretty stale and old. I've been playing percussion, Bass, and piano since 2002 or somewhere close to there, I started learning guitar, drums, uke, and harmonica there afterwards. As an amateur musician, I don't get the same fulfillment playing guitar hero as I do playing a real instrument, but I still think it's fun, so what if people want to play a fake instrument?
Some people don't have the dexteriety, skill or rhythm to play guitar, drums, bass, etc, it's just a fact, you can practice all you want but you still need the mind and movement of a musician, If playing guitar hero fulfills people who otherwise would never be able to play those songs in real life, then let them have that fulfillment, at least they're getting exposed to great music, especially the kids, it's better for them to play guitar hero and acquire a taste for good music rather than sitting at the computer watching shit lil wayne or Drake videos.