Who ruined Harry Potter?

Rating: 1/10 (1 August 2007)

I have read and enjoyed all 7 Harry potter novels, and I watched and enjoyed the first 2 films, Azkaban and GOF were OK but not good. This however was awful, and when I say awful I really mean awful. I was genuinely on the verge of walking out of the theatre after about 30 minutes, the only reason I sat through this was because of my wife.
I will say that Dolores Umbridge and Sirius Black were really good. Harry Potter however was dreadful. Daniel Radcliffe seems to have forgotten how to act on his way through puberty. I mean he was excellent in the first two films so why was this so awful? He spent two hours literally panting and moaning, it was like he had been told to tense every muscle in his whole body and stay like that for every scene.
Then there was Dumbledore and trust me Michael Gambon cannot do Dumbledore. After Trelawny is fired and he tells Umbridge quite calmly that she can stay in the castle he then proceeds to shout at the students, "Don't you all have studying to do?", that was one of my biggest wtf moments.
Percy doesn't speak at all, and Malfoy has literally one line in the whole film. How about explaining that Umbridge was the one who set the Dementors on Harry in the first place, and then they actually changed how the Dementors looked, I mean film 3 got it spot on. Then there was just ridiculous stuff like a Dementor strangling Harry, so he stabs it in the eye with his wand? Then there was Fred and George leaving Hogwarts, the whole reason that they caused a big scene and commotion was so that Harry could use Umbridges fire in her office and find out about Sirius. How about Kreacher lying to Harry? How about revealing that Snape DID go and find out about Sirius and was merely pretending to be ignorant to Umbridge? My biggest disappointment however by far was the end fight scene's between the death eaters and the Order of the Phoenix, in particular Dumbledore and Voldemort. Bellatrix does not kill Sirius with the Avada Kedavra curse, she stuns him into one of those weird curtained doors, and then he disappears. The fight between Dumbledore and Voldemort was basically a giant light show where the cgi people were probably told "Go to town, let your imagination run wild".
How about Dumbledore taunting Voldemort by calling him Tom all the time, and avoiding his killing curses rather than fighting back? How about Dumbledore being shown to be far more powerful than Riddle and choosing for reasons that I can't remember now not to kill him? The other thing about Dumbledore as well is that he appears to dissaparate from Hogwarts which Hermione says repeatedly throughout the books is not possible.
I probably haven't covered everything, but these films definitely went downhill big time after Chamber of Secrets. You leave the cinema feeling like all you saw was lots of clips strung together, and that loads of things were missing, and it all happened in a massive rush, you don't get that sense of satisfaction that you should get after watching a good film. Whether you've read the book or not, I would say avoid at all costs, and if you haven't read the book, then buy the book and read it, it will give you infinitely more pleasure that the torture you have to suffer to watch this film.