Let me admit that my lovely daughter loved "Hannah Montana" before the show.
We attended the Disney "Jingle Jam 6" and, if you wonder about how commercialism might affect your child, I'd suggest you attend the show in your area for a dose of reality.
First, this is basically harmless entertainment. However, the fantasy and commercialism become all too apparent at one of Disney's free concerts. I like Disney's support for young performers, but as may be expected by a free "cattle call," the show was an object lesson in crass commericalism and bad parental behavior.
Sadly, the bottom line: My daughter was annoyed and Hannah lost her lustre: 4 hour wait, 20 minute show, spectacularly unhealthy food after an inordinate wait, and no live musicians.
Into every life a little rain must fall.