We've watched these movies since the beginning and are amazed at how all of the children/teenagers have grown into their roles in such an appropriate fashion. Their acting is grade A! Other than Ginny, who we think is weakly cast, the rest are extremely well-suited.
The movie itself is well-adapted and highly entertaining. As usual, they cut a lot out of the book, but it's not possible to include everything. It's done VERY WELL.