I don't have a lot to say about it except that I did enjoy it but there was so much missing. Sadly you almost have to have read the book to really understand what is going on in the movie. Until the big event at the end of the movie (avoiding a spoiler here) it was almost a comedy with Harry and Ron and their girl problems and teen-aged angst problems.
In many ways this, and its corresponding book are not so much stand alone, but lay the ground work for the seventh and final installation. (Or in the case of the movie, installation 7 and 7 ½.)
It lacks the relevance to the current world situation that Rawlings inadvertently(?) included in The Order of the Phoenix such as political correctness endangering innocent people because those in power felt threatened by the people knowing what was really happening.
The girl who played Ron's initial girl-friend, Lavender Brown, really did a good job of playing a world-class ditz. I just hope she was really acting and not just being herself. Also Emma Watson, who plays Hermoine, is really turning out to be an attractive young woman who also quite a good actress; I was quite unimpressed with her early on and am pleasantly surprised.
Three stars. I expect the finale to have 4+.