Since I realize that there are people who may not have seen the movie yet, I’m just going to post a link to my thought over on LiveJournal.
The entry is public, please let me know what you think.
My thoughts on Harry Potter and the Half-Blood Prince
Submitted by hmrpotter on July 15th, 2009

Loved the movie, I'm glad you can separate the movies from the books. Hardcore fans tend to to get caught up in comparisons to the books, it happened with Watchmen and Lord of the Rings. Lets be honest if you included everything in the books 2.5 hour movies would end up being 4 hours long which is entirley to long for a film. When you move from one medium to another you have to make adjustments. I'm glad to see you can make the a distinction