It feels as if you were watching 2 different movies. On one side, there is the fun adventure of beasts roaming old New York and shenanigans commence. But then there is the more serious subplot centered about an Obscurus. The two plots absolutely do not work together. You keep switching between the lighthearted beasts stuff that has very little to do with the rest of the plot and than back to the more serious stuff as if you were switching TV channels. If the movie were to pick one of these themes and go with it, it could have been fine either way, but this weird mix. Doesn't work. I feel like they wanted to tell the more serious story but also needed somehow to tag it onto the Fantastic Beasts IP. The original book which I have at home from 2001 was an expanded universe textbook with a list of some fun beasts and no plot. Just a textbook. I don't think any of the beasts introduced in this movie were even featured in said book, so what is the actual plot if not a cash grab?