The 6th Harry Potter film was a good way to spend your evening. It followed the overall feel of the book and contained enough of the story plots to continue the viewer through the time line.
Honestly, the 6th book is not one of my favorites. It seems to repeat a theme with the textbook (Tom Riddle's Diary) and has no one main idea for this installment of the series.
The movie is similar with the advantage of being visual. It is a visually stunning film. This made the movie better than the book in my opinion.