SLIGHT SPOILERS (it's more of a key detail than a spoiler)
I honestly don't get why people are hating on this movie so much? Yes they let Johnny go, and that was a terrible act on their part, but I think they made up for it by putting Mads in his place. In my opinion, replacing Depp also meant getting a new character design, which was a smart move. Since we have met the halfway point of the story, and the conflict at hand is becoming more major than before, it seems only smart to do away with the cartoon-ish character design from the first two movies and make Gellert into a much more serious and respected villain. I mean, imagine Albus admitting his love to the former cartoon like Gellert!
This one is probably my favorite of them all.