I'm a Tolkein nerd and I looooove the movies. It doesn't automatically offend me when a movie deviates from the book. Yeah, the movies have their flaws...although FoTR was damn near close to perfect for me. I liked how RoTK included Shelob and didn't break the two stories into completely separate chapters. Having Arwen rescue Frodo in FoTR was much more meaningful than when it was done by an elf general whom we never hear from again. Elves in Helm's Deep? Probably how the geeks on the writing staff let the audience know that elves were indeed involved in the war. Not to say that there's stuff in the movies I didn't like, but FoTR is definitely in my top 5 movie list.
I for one hope that the Hobbit movie is even LESS faithful to the original material than the LoTR trilogy. The Hobbit was written in a very different style than the other three. Great though it is, I'm not ready for talking spiders and eagles, Gandalf with little stars on his hat, or riddles with a giant (again talking) dragon. Mad props if they can pull of the ogre's turning to stone or the introduction of the dwarves to the shapeshifter in a non-embarassing way.
I know I've committed some sort of heresy. Sorry.
Jam it back in, in the dark.