If you haven't read the book or seen the movie, turn back, unless you don't care.
Personally, I was really disappointed with the 5th one, so going in to #6, I was concerned that it was going to be terrible. Honestly, I don't know what the director changed, but he certainly changed the right things, because I thought this was the best HP movie in the series. The 1st was definitely good just because it was the 1st, and it was a new experience, while the second was relievingly well done, considering most sequels are bad. The third was okay, but a bit forgetful, as it doesn't really stand out to me. The 4th is my favorite book, so personally, the movie was pretty good to me, but like the 5th, they left out quite a bit. The 5th was absolutely disgusting, a disappointment of a movie, the only good part was the fight at the end. I just did not like it. The 6th one was a VERY nice pickmeup from that, and I absolutely loved it.
The cinematography was really nice, I notice this sort of stuff because I took a video production class, and I noticed a lot of shoddy work in the fifth one, but they had some interesting stuff in the 6th one, along with a few shots using some sort of different film or filter, because they were kind of out of focus, but in a purposeful way. There were a few iconic striking shots in this film, which I appreciated. One shot I really enjoyed is when Harry is chasing after Snape near the end, and it just shows them on either side of the screen while they just look at eachother, it was well done. And they had some really nice closeups as well. On the other end of the spectrum, I thought it was a bit simple, as I do with all films, because most movies and TV shows have a fairly simple shot system going on, whereas I like a more complex set of editing and shots (check out my video groups films at http://www.youtube.com/spagneti for clarification.) So it's not JUST this movie, but still, I'm not enthralled with the variety here.
As for the story, I thought it made a good similarity to the book. They took a few artistic licenses with some parts, for example, when they are at The Burrow, but they still end up with the same outcome. Also, I found that they kept far more of the content in the book than the 5th, and while they still left some things out, I felt they kept enough in this time. Some things would have been good to keep the same though, because at the end, it seemed a bit off since Harry wasn't actually stunned, and that he saw Snape before IT happened, but like I said, same outcome, so not a huge deal.
Overall, I liked this movie quite a bit, and would recommend it to anybody who's interested in Harry Potter, fantasy, science fiction, or action movies. I give it a 9/10.