Saw this movie over the weekend. I'd give it a 3.5-4.0/5. Very well paced for me, humorous at times which was a little surprising, lots of character building and setup for something more to come. Really deepens Grindelwald's stance on things and sets up the final faceoff we all know is coming.
Unlike the 2nd one, the plot was pretty clear and progressed linearly. Certain aspects required a pretty good understanding of the lore from the books to really understand, but they were explained well enough that if you didn't remember everything form the books you could still follow along easily.
Overall it was an enjoyable movie, which left me wanting to see what happens next, and well worth the price of admission.