I liked it, I would probably say its the best movie so far. I didn't really like some parts of the acting. Those kids, especially the one playing Harry, need to be able to perform on a higher level.
*spoiler*
When Harry ran outside after finding out the truth and he was crying. It was really bad, he wasn't crying. He did a pretty good job of being angry, but he couldn't pull off a scene requiring that kind of emotion. I would say he is better in this movie than the last two, but I just hope he refines his acting for the next movie.
With that little bit of complaining out of the way I wanted to say my favorite part was when they went and rescued
Sirius from his cell and flew away. I couldn't help but smile, I couldn't control it.
8/10