Two thumbs up!!! This movie is a tribute to rock 'n' roll. AC/DC, Led Zeppelin, Cream, The Ramones, The Clash, The Who, Stevie Nicks and more.
This is a story of a looser without job that gets a call for a friend and become him. We have seen that. But this movie entertains you from the beginning to the end with full of joy and jokes and very good performances (specially Joan Cusack). And you have the music and memorable quotes and moments (when Dewey seduces Rosalie, the principal of the school is epic). And the kids can act, and know how to do it. They are gifted. Musically speaking (all of them) and some of them acting (one of the best is Kevin Clark as Freddie the drummer). I saw this movie twice and I find it excellent.
Well, if you want to find defects you could say about that we seen this, some things like how can he be a teacher without giving information or how he entered teaching in the school. Or if you thing Jack Black overacts. That may be true but the overacting is the main characteristic of his character.
With brilliant moments, the great music and the fact that you wont be looking at your watch to see how many minutes left and this is very important because it's related to be bored.
The performances are great and I salute you, Richard Linklater, Mike White, Jack Black, the kids and specially Joan Cusack.
Finally I would have liked that the song School of Rock would have had a nomination for the Academy Awards. A pity. I rate this movie a 10 out of 10.