Without a doubt, this is the best movie I've seen in theaters this year. I had to restrain myself from jumping up and cheering throughout the film. It was smart and funny in a way even I hadn't expected it to be.
As mentioned by my better half, this movie has Jack Black, "stickin' it to the Man" and making sure his students know what that means. So, when the principal disciplines one of the boys for dressing "punk", which is against school dress code, his friend says to her, "You're the Man." She responds, "Why, thank you," and walks on, pleased with herself while the kids laugh at what they've just said. If that doesn't underscore for you what kind of film this is, I don't know what will.
You owe yourself a favor. Go see School of Rock. It's educational.