Common misconception thanks to goddamn Peter Jackson. He was not a reluctant hero in the books. He was fully accepting of his responsibilities, and further motivated by his love for Arwen when Elrond declared that he would not allow his daughter to marry him and give up her immortality unless he fulfilled his role in claiming the throne of Gondor. His long years as a ranger were a form of training and of hiding for if his existence and full importance became widespread knowledge, he would have been hunted ruthlessly.
The movie's remake of his character was, in my opinion, cliche hollywood fake character depth. This was employed with every character in the entire story which robbed the entire protagonist cast of their sense of nobility, which was a pretty horrendous thing to do considering Tolkien's original cultural context and intentions.
I wouldn't argue with any of that. But I was comparing two movie characters instead of a book character and a movie character.
The thing about movies from books (pre-warning, my own rant incoming soon!) is that the two media are so fundamentally different that you cannot impart either to the other. Tom Bombadil wouldn't have worked with an American audience, so he was removed. Without that context, the entire universe changes slightly. Same goes for everything else that was changed. If you take the LotR movies as adaptations and compare them to other movies, they stand up pretty well. If you compare it to the books that had time to nuance and define an entire universe... not as much. (Some changes were still kinda dumb, Saruman, Gimli as comic relief, etc.)
My own rant: Watchmen. The entire production cast was adamant about changing it as little as possible, then of the three major changes, two were flagrantly unnecessary. Dan and Laurie fighting the muggers... movie added gore for its' own sake. They weren't brutal vigilantes, just people in decent shape that were defnding themselves. Rorschach tearing up the pedophile just made him seem like a psychopath. Character derail.
The difference in my viewing of the two is: LotR wasn't a visual media, and I don't recall Jackson saying anything other than "I'll do my best." Watchmen WAS a visual media and the movie makers chose to stray from that and lie about it blatantly. It still got the message across, I thought, which LotR utterly failed to do.
Aw, who am I kidding, Watchmen was just a couple hours of blue CGI penis, right?