Well overall the movie was good. They did their best to put as much of the story into the movie as they could with the time allowed.
Unfortunately, the studio didn't bring back John Williams for the musical score. The now famous Harry Potter theme was only present in the title scene and credits; and shortly at that. Hopefully they'll see fit to bring him back for Harry Potter and the Order of the Phoenix.
My other complaint is that the Hogwart's castle is vastly different from the first three movies. I had to wonder whether there was anyone worried about continuity.