Overall i did like the movies, but some things that made me mad that the filmmakers cut out was:
Peeves the Poltergeist was never in the movie
The part in the department of Mysteries, I really don't think That part was written out very well, it didn't have all the things that happened to them, like all the other rooms they went into.

In the Half-Blood prince they showed Harry and Dumbledore going into what, two memories not even..