So, I thought about what to write and it's really hard to find the right words here. Contains some spoilers, of course:
First of all I have to say, the actors were great, and the show itself was pleasing to watch. I loved that they put little details in there which made it very personal (e.g. the writings on the curtain):
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I tried to read as little as possible about the musical before I watched it, so I was a little...surprised when there was a lot about Michael's personality in there and about his thoughts/feelings etc., I expected it to mainly focus on his music. On one hand I think that is a positive thing, also because they put some details in there that maybe some people didn't know. So eventually that will make them think differently about Michael. It was very good depicted how the media and his father put endless pressure on him. On the other hand it was quite...heavy this way and I expected a fun show, so that's why I still think about if I liked the musical or not so much.
I think it's great that they also used songs which are not as well-known, the costumes were very accurate.
I didn't like (and that is mainly because I have a little - or big - Adrian Monk living inside of me):
- The dance steps were mixed, sometimes not like in the original songs
- The speaking voices of the "Michaels" were too soft, they almost whispered, I found that a little...too much/weird
- The singing voices of the "Michaels" were not sooo pleasant for my ears
- Some songs/performances were too short
- They had the Toaster
but didn't do the Lean like wtf 
I really don't want to discredit the show, it was great, super atmosphere, but I didn't feel Michael's soul in there, if that makes sense... but maybe that's just me.
My mum loved it, we also watched Lion King, she said she liked the MJ musical better. My first place would be Lion King, I nearly cried - mainly because of the actress for Rafiki (Bongiwe Malunga) she did such an amazing job, like...wow...funny af, breathtaking voice, I was really overwhelmed and I didn't have that in the MJ musical.
BUT nevertheless it was a great show and maybe I am just too Monk-ish

. The actors really put a lot of work in there and analyzed and understood him as a human being, that is what I liked the most.