HP-HBP is a good movie - but don't expect it to be true to the book. The end, in particular, is heavily rewritten - argh, I wanted another magic battle. It's nice to see Dumbledore get a great sendoff - his part was much more important this time around.
The three teens, like the last film, are not understandable unless it's a non-action segment - but usually they are speaking so fast that you can only get every third word.
I know it's hard to get such a thick book into a 150 minutes movie - but I've never liked it when important parts get rewritten. It's why I am giving this film a lower than usual rating.