Peter doesn't necessarily buy it, but because he thinks there's not much there he knows that that's precisely the point, which means everything.
At first listen, the lyrics seem banal and gratuitously hate driven, so one may retreat to the music, which really is first rate. But then something happens with regard to the lyrics, and they become neither hate-driven nor banal. Not exactly funny, per se, but, rather, honest in a way that's both ridiculous and upsetting. So, well, real.
Let's just get something straight right now: Kyle is an above average guitar player, and gets a sound out of his acoustic that's almost enviable.
I think it's fair to say that Tenacious D is congruent artistically with Spinal Tap. Christopher and Michael are very good musicians. But Jack is a really good musician, and is more invested in Tenacious D than Chris and Mike were in Tap, or The Folksman, for that matter. And though Spinal Tap is more sophisticated, Tenacious D, at least for me, ends up being more authentic, for better or worse.
No, Jack. Metal never died. It just went gay for awhile there.