ANNIE--I've had to sit through so many bad productions of this show (due to people I know being in it, etc.) that I never wanted to hear about it again. Then I ended up directing it (?) and actually working on it made me appreciate it.
GUYS AND DOLLS--same thing--SO sick of bad high school, community theatre, etc., productions, but working on it (twice) won me over.
FOOTLOOSE and FAME--extremely bad books, but both shows have so much youthful energy in the music and staging that they're irresistible when the cast is in the right spirit.
On the other hand, I've worked on two productions of BRIGADOON and two SOUND OF MUSICs, and I haven't been able to find anything redeeming about either show--I still think they're the sappiest, most insipid musicals ever written.
I ask in all honesty/What would life be?/Without a song and a dance, what are we?/So I say "Thank you for the music/For giving it to me."