Come on, seriously - I know this is about opinion, but you seriously have to question some that list CABARET, CAROUSEL, and RENT as the worst show they have ever seen. Perhaps it was a terrible production, I'll allow them that, but by no means are those shows - ESPECIALLY Cabaret and Carousel bad shows. I will never understand that, but, it's all about opinion and to be honest, I pity those who would deem Cabaret and Carousel as "the worst."
For me, DRACULA and OLDEST LIVING CONFEDERATE WIDOW TELLS ALL are the two that come to mind first. I've never contemplated suicide before - especially in a Broadway theatre - until I had the misfortune of seeing those shows.
"If you are going to do something, do it well. And leave something witchy."
-Charlie Manson