Of the shows mentioned, Hamilton aside, which I cannot comment on.
Chicago- I feel it's a punching bag on here, I've seen various casts 4 times, matinees and evenings and have yet to be disappointed. I've only ever seen one Velma other then Amra, that was Carly Hughes. As long as Amra has been in, she has never walked through it- not my fave, but I'm being honest. The score is a great score, Kander and Ebb still translates. Fosse is extremely difficult to pull off and easily detectable if one person is lazy, that cast is not.
Phantom- I saw it last when Sierra and Norm were together in it and it felt so much fresher then my previous visits.
Wicked- I have only been disappointed once, a particular understudy was on for Glinda and she was just not as big as the part, and this was a Saturday night, the cast felt really low energy. I've seen it since and it was better- even with a new Glinda understudy- Tess Soltau was great.
Mormon- I saw with Creel twice years ago and it was rock solid.
I have not seen Lion King in years, but I'm disappointed to hear it's declined in quality.