I didn't like the first movie (I fell asleep in the theater and had to watch it again on TV). But I wanted to like this one, I really wanted. What a letdown! What I hated about this movie:
The pace: soooooo boring. Damn, I almost fell asleep again. Twice!
The plot: One major flaw of the first movie was the characters. People generally liked Newt and Tina, but hated Queenie, Jacob and Creedance. In this movie, here we go again. 3/4 of the movie is dedicated to Creedance backstory and Jacob/Queenie "complicated" relationship.
So many useless subplots: soooo many backstories, sooooo many red herrings.
The acting: I didn't see Grindelwald. I saw Johnny Depp with a ton of makeup.


In conclusion, the fantastic beasts saga is The Hobbit of Harry Potter. Boring prequels filled with streched boring plot and a ton of fanservice.