The MUNY is a nearly hundred year old institution of both St. Louis and summer stock. Famous people have been playing the MUNY almost since it's inception. Folks like Ethel Merman, Carol Channing, Pearl Bailey, Bette Davis, Tynne Daly, Yul Brynner, Robert Goulet, Joel Grey, Sid Ceasar, Carol Burnett, Madeline Kahn, Zero Mostel, Bernadette Peters, Debbie Reynolds, Tommy Tune, Betty White... and there's lots more.
The MUNY is so huge (more than 5 times the capacity of the Palace, which originally housed the Broadway production of Beauty & the Beast) that more detailed sets would simply be lost. Shows run for a week, so there's really no point in making the sets high quality because they're just going to be junked.
I hate the MUNY, but you should know what something is before you trash it. It's not that your opinion is unpopular, just painfully ignorant.
Jesus saves. I spend.