Saw the Secrets of Dumbledore.
They simplified it by removing at the focus on at least one character and used a McGuffin ala how the Deathly Hallows were brought up in the last book.
Still, there's at least one scene that could have been cut out (though it probably had the big funny reaction from the audience).
Also, went into Eastern myth. Which is... New? Btw, how's marriage arranged in the wizarding world? Like do they use priests? Which religion would they use?
Edit - oh Mads was actually fine. It's not distracting to have him around instead of Depp.
Overall, less bombastic compared to the Crimes movie (a bit slow ish at the start) but it's much simpler and easier to follow.
They leaned up the cast focus and extra plots but probably couldn't resist adding a superfluous bit to make sure there's a fantastic beast.
I'd saw first movie is obviously the best of the three. Crimes was still needed to show how evil Grindelwald is but if they added more of that in Secrets, could have done without it.
Oh also I'm invested the most in Queenie and Jacob but Jude Law as Dumbledore was surprisingly nice.