IMO, Lennon and ASU are nothing short of spectacular.
also IMO, Mamma Mia! is not even close to spectacular, because the leaps weren't (as in ASU's case) reminiscent of a beach party or Elvis movie, or any other genre, but rather they felt forced to me. the mother is apparently a wh*** who doesn't know who is the father of her daughter-- and she just *happened* to have been a singer with her two closest friends? awfully convenient, since that little ploy squeezed a few more songs into the show. i think that, while ASU made quite a few leaps of its own, the entire show is reminiscent of an Elvis movie, and therefore makes sense, given the score. but it's only my opinion.
anywho... i think that a good jukebox musical needs just one thing: for the public to NOT use the term "jukebox musical", at least not in a derogatory sense. part of the reason Mamma Mia! was (is) so successful is because it was the first Broadway saw (at least, the first in a long long time) and was viewed with an open mind. once this term was coined, and seemed to come with its own built-in sneer, it is used to describe musicals, but not as a descriptive word but rather as a reason for people not to purchase tickets, as though a pre-existing score=horrible theatre experience. i couldn't disagree more.
"It's not for sissies, contrary to popular belief." - Tommy Tune, on musical theatre.
My avatar: Yummy, no?