I thought this was a great movie. I have read all the books, but it's been about four years since I've read the half-blood prince. Of course they can't include everything that happened in the book otherwise the movie would be waaay too long. I love watching these movies b/c it puts a visual on what I thought things might look like.
I loved harry's sarcasm in this movie and the relationships were an important part in the books, so I'm glad they depicted that part well. The final scene was also not disappointing. IF you love the books, just don't re-read them before you see it; b/c you might end up disappointed with details they left out. Overall: great movie!