2. The Lord of the Rings
Films: The Lord of the Rings: The Fellowship of the Rings (2001), The Lord of the Rings: The Two Towers (2002), The Lord of the Rings: The Return of the King (2003), The Hobbit: An Unexpected Journey (2012)
The Hobbit caught some flak for the ratio of eating scenes to battle scenes, and proved that the world is not ready for 48 frames per second, the film is enjoyable enough to keep Middle-Earth in the good graces of the Franchise Gods.
Ultimately, source material matters. When you have a man as meticulous as Tolkien at the heart of a series, the challenge is what not to include, always a good problem to have.
Even if he could've been made for Tom Bombadil and maybe ditched Radagast, Peter Jackson has been a passionate, capable steward of one of the greatest stories ever told.