While I've read the book, it's been a while, so I can't comment too much on how faithful the adaptation is. Like the other movies, it seems to be a bit simplified, but much like the book, it's a darker story than the previous two.

Beyond that, there's not really much to say about these movies. By now, you've made up your mind on Harry Potter, and this movie won't really change it. It's a good movie, but doesn't do much to change the line of movies.