Carousel is a wonderful movie musical. Originally supposed to star Frank Sinatra, Gordon McRae does an admirable job as Billy. It is one of my favorites.
My Fair Lady is also a classic.
In the category of worst I would have to say
A Chorus Line and
Godspell.
Forum is alright, but I hate that they had to cut so much. Also a lot of the camera work is odd.
I am also not a big fan of
Jesus Christ Superstar because of the artistic choices made (I would rather it just be cut and dry and not have all the tanks and guns, etc.) but I know that it is respected by a lot of people for BEING artistic.
I think
The Fantasticks as a movie works ok. Although as a fan of the show I hated to see "It Depends on What You Pay" cut and all of the additional orchestrations and scenic elements added in. However, if you are going to have a film version of this intimate no-frills show then you have to have those things. I am on the fence about this one...
"You pile up enough tomorrows, and you'll find you are left with nothing but a lot of empty yesterdays. I don't know about you, but I'd like to make today worth remembering." --Harold Hill from The Music Man