The Movie Review:
(jen you've already seen this)
I go in expecting it to be mediocre. I didn't expect it to live up to the book but considering the facts, they did a pretty good job. Sometimes, its unfortunate, but they had problems explaining things. Some parts I couldn't remember from the book until they did half of it on screen. Like the hole in the Whomping Willow. How Lupin knows how to imobolize it (and that they planted it his first year – although those kind of things are difficult to include). Why exactly Peter Pettigrew is an animagus, and Sirius. Regarding the Firebolt – why and how Sirius sent it. Who Prongs, Padfoot, Mooney and Wormtail are. And yes, Harry's stag patronus. I liked Gary Oldman as Sirius.
I think it did a good job of the secrets. Not the best but it's a lot easier to show something in writing than it is in pictures. In writing you control exactly what the reader is seeing. You want the wind to be blowing? You mentioned it in writing. If you show wind on screen, chances are, over half of the people aren't going to notice it.
They made things really obvious with Hermione's watch, and really played up the Ron/Hermione thing, but I think it's just a focus of subplots. The movie, book too, would be boring if it was just 'One day Harry got into trouble, Harry talked to Dumbledore, Harry solved the problem.' It's more intriguing when there is deceit, and shady characters, and blackmail, and near-death experiences!