Yeah, I very much agree, Jackson turned Gollum into a very conflicted character with much pathos and made him much more heartbreaking. In the book, theres not much to him, he's bad but theres this little indication that theres still a bit of good somewhere there, but for the film Jackson really made his struggle between good and evil the character's focus. Its a shame that he was actually constrained by the book, because for me the logical conclusion of the trajectory Jackson set up was some kind of redemption, even if he still killed himself, because for most of Jackson's Return of the King Gollum just kind of casts aside all the wonderful conflict in the previous film and becomes bad. I kind of wish Jackson had dared be a bit more interpretive with the book here, but Tolkien fans already hate him as it is.