Honestly, it was a great movie. It doesn't flow like a regular movie but it's captivating in it's own way.
Mads' performance was brilliant. After watching this guy play Hannibal, I had no doubt in my mind that he'd be a fantastic Grindelwald, though I do not like the circumstances that led the studio hiring him.
It has some flaws and it is closer to a 4⭐ than to a 5, but considering the slew of unreasonably low ratings, I think it deserves a few 5⭐ to swing the overall to its favour.
And that's another thing to keep in mind. Do not pay attention to these so called "critics" carelessly crapping on this movie. Go see it and judge for yourself.