This movie killed the Fantastic Beast for me. While I understand they tried, replacing Grindelwald changed the dynamic of the movie. If we had been Grindelwald from the beginning, it would have worked; but the entire personality of a main character changed. It doesn’t work. On top of that, it is so painfully obvious that Bunty’s role in the film was meant for Tina. Lastly, Harry Potter is supposed to be magic and fun (even the darker movies are not “dark”). This movie is dark and I would not recommend for kids.
As much as it kills me to say this as a Potterhead, this is what I believe may be the unfortunate end to the franchise.