The screenplay is always silly but gets a bit over silly toward the end. For the most part its very good however with Broadbent and Spall standing out.
A straightforward plot but its well scripted and the casting is spot on. The ubiquitous and very adaptable Alfred Molina is a standout even with the quality of the other performers.
It would help if you are a fan of the kind of noise the kids produce. There are some interesting aspects raised in the documentary about the management side of their affairs but its not exactly enthralling.