Looking at the story lines, and the storytelling, you see the potential dangers with each film. The epic plotting of "The Fellowship of the Ring" threatens to ruin the movie more than once. Under the auspices of a lesser director, watching the film could be like watching a freight train go by. This happens, then this happens, then this happens, then this happens -- as our characters are tossed from action scene to action scene. Tolkien got away with this in the books because his writing was extraordinarily boring. You could never really tell you were being overstimulated.
But Jackson's ability to explain in simple ways why his characters go from place to place saves us from that fate. There is a clear goal, and every set piece builds on that goal. Additionally, the land tells the story as much as the characters do: Middle-earth is changing, the old ways are passing and every landscape shot alludes to these changes.
"Star Wars" also takes place during a time of transition. Every battered and rusty space transport implies a history of past battles and other stories. We don't get these deep stories in the "Star Wars" series. Our heroes blithely go from place to place, peril to peril, without the same clear goals. One of the most watchable aspects of the "Star Wars" plots is the focus not on the larger stories, but on the main characters, who affect the big picture, without really being a big part of it. The Rebel Alliance is always just about to start a new mission whenever Luke or Han Solo reach a base. There's a larger tale going on, one of tyranny, rebellion, political and social movement. But "Star Wars" focuses on the characters, not on that story. So, it makes for easier viewing than "Lord of the Rings," but it's not necessarily as compelling viewing.
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Still, the heart and soul of both films is character, not plot. After all, we remember "Star Wars" not as the tale of a vast and unmanageable empire, but as Luke's transformation from Toshi Station mall rat to mystic Jedi knight. Frodo Baggins, the hobbit hero of "The Fellowship of the Ring," also yearns for adventure. He idolizes his weird Uncle Bilbo's adventures, adventures that could take him from the boring but idyllic life in the Shire.
But when a wizard named Gandalf shows up with an all-important adventure that has to start immediately, what does Frodo do? He panics! He goes only reluctantly, always under the impression that he'll get to go home once the first step is through. Frodo doesn't just whine like Luke, he winces, cowers and weeps and is pretty much uncool through most of the film. And as such, the hobbit Frodo -- unlike fun, daring hero Luke Skywalker -- becomes more human than the human Skywalker.
Luke is what whiny dorks daydream they would be. When adventure comes calling, they'd sign up immediately, and succeed totally. Frodo, on the other hand, is the way we are: comfortable in our inadequate lives, yet terrified of change. I cry like a baby if the candy machine at work is on the fritz. If I were being chased by some spectral hooded spirit out for my blood, I'd likely go catatonic.