I saw the trailer it looked like it will be better/funnier then Nacho Libre (but maybe not as funny as Kung Fu Panda). I will probably go see it even if it bad just because I think Jack Black is so hysterical.
Gotta Say I'm a massive fan of Jack Black, and it was in fact his music that got me into his films. We have almost exactly the same taste in music and humor, so vulger/black comedy + Ronnie James Dio = win
So yes, like all his projects I will def be watchin this film !