I think Guitar Hero is a bridge that draws people attention to these old school rock music and hopefully in a bid to get them interested in picking up a real instrument to play.
On hind sight, it is just a leisure game but those who are not musically inclined to have a chance to rock out, in their bedroom. I find it to be a socially engaging game when I played the rock band with my mates, some of musicians, some not.
@ the end of the day, we all had fun and get us talking about music, which is good.