The Wiz got a very mixed bag of reviews and it was borrowed money and a dynamite commercial that put it over.
Evita
Cats
Titanic
Hallelujah Baby
Passion
All had a mixed-to-bad set of reviews. The last three lost money. Also those three seasons were very weak for musicals.
42nd Street did get a good set of reviews and A Chorus Line got some of the best reviews of the century.
The critics and intelligencia loved Sunday in the Park. However audiences hated it and so did a lot of the rank and file Tony voters.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher