"Love" is probably a little strong. But the musical that I know all the words to and still consider terrible and saccharine and contributing to the demise of musical theatre:
Wicked.
One that I own the OBC of, but don't listen to religiously:
Zanna, Don't!
Musicals that have songs I enjoy (despite words exchanged with Marc Shaiman on one of these very message boards):
Hairspray
Footloose
But I should tell you that a search for this topic came up with:
GUILTY PLEASURES....
Favorite Guilty Pleasure
Guilty Pleasures Question
Guilty pleasure musicals
Guilty Pleasures
Guilty Pleasure Flop
Your guiltiest pleasure
Our Guilty Pleasures...
GUILTY PLEASURES
Guilty Pleasure Shows
Guilty pleasure shows?
Guilty Pleasures
theatre.