I thought the movie itself was pretty ok, but i was seriously disappointed by how much the movie strayed from the book for just silly things.  For instance, what the hell was that weird ass corn field seen where they blew the fuck up out of the weasley's house?  There's going to be a wedding there in 3 months, isn't there?  Also, why wouldn't they do the scene in the beginning correctly where dumbledore meets with the Dursley's?  That would have been a sweet scene.  Same with when Scumfregour (whatever his name is, new minister) talks with Harry over Christmas.  Also, how Harry got injured in quidditch and that's how him and Ginny get together.  It's just little things that they didn't need to leave out or change that made me mad.
The final scene... why wasn't Harry paralyzed?  Why wasn't there a sweet battle at the end where Bill gets his face all fucked up?  I'm just frustrated with how much they could have done, but just chose not to.
I reread the book in order to watch the movie and i think i would have been better off just going to the movie without rereading the book.