I don’t regret seeing any shows, even shows I didn’t enjoy that much. I didn’t enjoy the current revival of My Fair Lady that much, but I am glad I finally got to see Norbert Leo Butz (who was the highlight). I also was underwhelmed by OOTI, but I have sat through worse on tours.
As far as my least favorites shows on tour, they were all performed well. They just didn’t live up to expectations. Still, I don’t regret seeing Cats and Phantom because I saw them both with my parents and now that my dad is dead and my mom has dementia, I value those memories. I also didn’t enjoy The Producers that much, but what you don’t enjoy makes you appreciate good theater experiences that much more.
I also saw Naked Boys Singing at the end of my 2013 trip. It wasn’t great, but it was a fun end to my trip and it had at least one (or should I say about 6) redeeming features(s).
In all, I’ve been lucky to not sit through any true trainwrecks.