I saw the film last night so the details are still fresh in my mind, and I thought it CRAP!
My main complaint is that the book is better, I mean, for a book that was focusing on Dumbledore the filmakers sure as hell didn't include him much, opting to show off Harry and Ginny's pointless relationship for more than half the film.
While they stayed truer to events than in some films some things they change are bloody awful, for example the scene at the burrow's demise was utterly useless with the rather cliche runnnig through the crops, although in this case they were reeds. The whole of Dumbledore's death was rubbish as well. In the book Dumbledore paralyzes Harry hence giving Draco the oppurtinity to disarm him, making Harry interestingly unable to do anything but watch, invisible (he had the cloak on). In the film though they decided to make Dumbledore tell Harry to stay hidden instead. Draco rather anticlimatically disarms Dumbledore and Harry chooses to do nothing - very unHarrylike. Then when Snape tells Harry to shut it, Harry does nothing AGAIN despite him suspecting Snape all along. Oh and one minor irk, Dumbledore falling off the tower in slo-mo was crap as well, I was hoping for him to fall down Isengard style.
My largest annoyance was that cut the fight with the death-eaters. When Dumbledore and Harry get back there's a massive fight in Hogwarts between the order of the pheonix and the death-eaters. It was a good part of the book, and I was looking forward to it in the film, it could have been the jewel in their shit-stained crown. BUT THEY CUT IT! No doubt to replace it with more self-harm inducing scenes with Harry and Ginny and Ron and Hermione and some books and UNSUFFERABLE BOREDOM!
Oh and Harry's getting prettier and prettier every film, in this one you saw his scar once and his hair's looking distinctly un-messy. Honestly it's not Harry in the films any more it's just Daniel Radcliffe.
However despite all this the special effects were excellent, but the only film I've ever let off for shitty acting, writing, and everything was Tranformers, so HP isn't gonna get off that easy.
The actor the Draco (someone tell me his name) was good and played the part very well.
PS Ron was only put in for laughs and crappily done. Fenrir Greyback needed to be better put in as well.
I'm done, I want to write more though, about the Half-blood prince and Hagrid though.
All in all a very very poor attempt. Chamber of Secrets is still the best.