The first movie had an amazing expansive world to set its story in. The problem was, it focused more on the building OF the world than the story IN the world.

The second movie also had this problem, although to a significantly lesser degree. Here, the story is minimally interrupted by building up the world its set in and, although the world is interesting and expansive, it served more as a distraction from the story.

The third movie mastered this. The amazing and expansive world is there to help the story, rather than the story being there to help it. The fourth movie also understood this.

But each movie introduced some subtle concept into the mythos. Each concept from each movie is present as a brilliantly used device to tell the story of this film, part of why it is the best one. The first two films had this, but instead of being there to tell the story, it was just there. Here, it actually is there in a way that helps the narrative of the story along, like the books. The amazing mythos isn't distracting, like in the first two films, but isn't ignored almost completely for the sake of the story like in the middle films.

If Harry Potter is the master of death, this film is truly, the master of storytelling.