I watched the second one today. It is a typical "middle" of a movie series. There were lots of things going on, lots of people, lots of creatures, lots of confusion. I really would rather these were books instead of movies. This movie was a waste of 2 hours of my life.
A couple of thoughts (non-spoiler) if you do decide to see it.
Johnny Depp is almost unrecognizable.
This movie takes place in 1927. I don't know you much you remember about Grindewald from the books or other movies. One of Grindewald's reasons that the magical world needs to dominate muggles (or nomag as they are called in the US) is to prevent WWII from happening. One of the unexplained things in the movie is how does a wizard in 1927 have images of bombed out London or an A-bomb explosion?
The story needs detail, and backstory but doing it in a movie simply doesn't work.