Welcome to Harry Potter Theory. Today we're looking at casting decisions made for the Harry Potter films. Now, I thought that the casting in Harry Potter was great- across pretty much all of the films, for pretty much all of the roles. There wasn’t a single role where I felt that that the actor themself took away from the character- however there were of course some instances in which the film portrayal of the character didn’t exactly fit with the book. I.e Bonnie Wright with Ginnie. 
And while I think that the Harry Potter films did a fantastic job overall, I can’t quite say the same for the Fantastic Beasts films, at least the ones we’ve had so far- they weren’t bad, but definitely not as good as Harry Potter.