I went to this HP movie with different expectations from the others because frankly its tiresome to hear the comparison of movie to book. The books will always be better.
As far as what was included in the movie, it was fantastic how close to the book they did come. The elements they did change to fit it into the time frame, worked amazingly well. I recognize the two formats for what they are, and of course the book can contain way more. I am just glad this movie cut out all the right things. Unfortunately, imo this movie also had some of the worst acting( perfect examples: gryffindor common room w/ Seamus and the Hogs Head).
If you have read the book recently, you can follow along and definitely notice the changes they did make, but its ok! You know whats going on! If you haven't read the books, the first 40 minutes will seem incredibly rushed.
*spoilers*
Ginny's reducto curse in the dept. of Mysteries was fucking bad ass, only to be obliterated later by Voldemort and Dumbledore. I will likely watch the whole movie again just for that scene =D.