The movie was excellent; however, I believe the subjects focused on (teenage romance, mostly) were too light for the overall feeling the book portrayed. The Dark Lord is supposed to be back, Death Eaters are reaking havoc everywhere, but Ron, Hermoine, and Harry are cracking jokes about snogging. The Order of the Phoenix, I thought, set an appropriate mood that this movie did not follow through on.
I also did not really understand the purpose of the scene at the Weasley's house or why, in the final scene, Harry was not immobilized.
Overall, I thought this movie was just a little less epic than I thought it would be, but still good nonetheless.