Books and film are two entirely different mediums and they don't really translate well. Long novels CANNOT be effectively condensed into a 2-hour movie and keep completely true to the storyline, it's impossible.

Film makers, when given the daunting task of turning a 300-600 page novel into a film need to cut the story to as much of the bare bones for it to work. Dialogue is trimmed, scenes taken out, it's not easy to condense a book into a 2-hour movie and I certainly wouldn't want to be the one to try (as my own style is novelization and not screenplay, I would likely do a terrible job of it anyway).

Yes, the movies are rushed. They have to be. They have 2 hours to tell an entire story that should be given much more time. And this isn't going to be changing.