1. I'm still not 100 percent convinced that this wonderfully bittersweet documentary isn't entirely a put-on.
2. A complicated portrait of complicated men, an adeptly assembled character study that shows how limitless fame and fortune might not be the real recipe for happiness.
3. Gervasi misses a few beats that would elevate this from enjoyable to resonant, but he's the only filmmaker for the job
4. Anvil! is one of the sweetest, funniest films I've seen this year. Also the loudest and most foulmouthed.
5. There's just something utterly winning about the way the guys of Anvil hang on to their dream -- and when, in the movie's final scenes, they find it for a moment, it creates some genuine, headbanging joy.
6. Anvil! The Story of Anvil is a documentary about the moderate rise and long, long fall of their band, where musicians in the two other slots came and went, but Lips and Robb rocked on.
7. The movie is a small wonder, because it's not the work of a practiced filmmaker - Sacha Gervasi is a writer and Anvil fan who shot the movie on a whim, but he has a great eye, and is evidently an editing whiz.
8. Anvil! The Story of Anvil can't help but evoke This Is Spinal Tap, the classic 1984 mockumentary directed by the other Rob Reiner, in terms of both sheer hair-metal ludicrousness and indignities suffered by a not-so-successful rock band on the road.
9. The most stirring release of the year thus far.
10. An outstanding rock documentary that is as funny/sad as it is revealing.

What is a brief summary of the following reviews?
A touching, uplifting and inspirational rockumentary about an aging metal band, both hilarious and heart-warming in equal measure.