This was a 'steady' flick
not as fun as Jack Black's other films but definitely better than Nacho Libre. Personally, this musical comedy is so much easier to digest than other operatic Broadway drivel, especially if you are a fan of Tenacious D (their song "Wonderboy" is a real hoot!).
Black and Kyle Gass make up the band that is Tenacious D. Listen to their song "Tribute" to better appreciate the movie (the video's hilarious, too!). The movie is a spin-off of the song, which tells the story of how Tenacious D was formed to become the world's greatest band by defeating Satan himself (played by the Foo Fighters' Dave Grohl). Watch out for other cameos by Ben Stiller (also the executive producer), John C. Reilly and many more.
The plot is thin and ridiculous but you continue to watch it anyway just because it can be irreverently fun (living out the essence of rock). Also, because rooting for the underdogs that Black and Gass areold, balding, tubby rockstar-wannabesis such a classic crowd-pleasing formula. Watch it if you like rock, don't take things so seriously, and just want to zone out for some self-indulgent me-time. :o)