Glancing at what other people have written about this movie, it seems that these individuals are taking this film a bit too seriously. Worrying about the "messages" this movie is delivering? Come on, there is no way that the con that Jack Black's character pulls off could ever get far in the real world! I don't think any sane person watching this movie would take this seriously. This is a comedy, for crying out loud, made to make us laugh!
I thought Black was fine in this movie. Sure, maybe his character is a little one-note with his proclamations of "rock on" and "stick it to the man", but Black somehow manages to do it over and over without being boring. He's unbelievably energetic AND versatile, delivering these same things in different ways each time that prevent the movie from getting into a rut. I think it's safe to say that only Black himself could have made this role work so well.
There is plenty of humor and great music. Even my senior citizen parents kept laughing, and told me after it was over that they enjoyed the rock soundtrack as well. It's a great movie for the whole family. Why was this rated PG-13? Sure, there are some references to stuff like alcohol and groupies, but they are not emphasized at all in their brief passing - and your kids will already have seen these kind of things treated much worse elsewhere! In fact, here in British Columbia, the ratings board gave it a "G" rating.
