Yeah, my son and I saw the movie today. It is, as reviewers have noted, the darkest of the Potter movies, though not so dark as to frighten my ten year old. Theres a little less dwelling on the whimsical element of the magical world than in the others and lots of adolescent sullenness. Unfortunately, you have to be acquainted with the characters through the books and/or the previous movies for the character development (such as it is) to make much sense or to win your sympathy for them. This is especially true of the Harry-Ron-Hermione trio. The older Weasley twins provide the lions share of the comic relief (and theyre good at it).
Bottom line: like all the others, this movie is inferior to the book. Well buy the DVD and enjoy it, as we have the others, but none of the Potter movies come as close to doing justice to the books as Peter Jacksons efforts did for LOTR. I also have a sneaking suspicion that well like this movie more.
For what its worth, the theater wasnt full for the showing we attended (noon today).