I went to the midnight release of Half Blood Prince and I must say, this movie was wicked awesome!!! Now, it deviated from the book a little bit....really the only biggest deviation was that the movie cut out a lot of the scenes from the book. But that is to be expected.
The acting was excellent. Dan Radcliffe played his role with vigor and Ron was hilarious. Ginny is turning into a cute girl that has a very sensual sense of humor (some of the scenes / scripting could be extrapolated into vulgar territory).
Overall, the acting was great. The movie itself, while dark, had plenty of comic relief that embellished the story line rather than distract the viewer from the main plot line.