So I really liked this for the most part. This was my first 3D movie in a theater since, like, the Disney stuff in the 90s so that was a little bit of a treat. For the most part how it was shot was beautiful and in a 3D IMAX theater I didn't find the visuals detracting from the experience the way people explained they would be. I did have some issues with the visuals and 3D stuff, like when there was quick action and the screen was panning side-to-side rather quickly basically everything on screen became an indiscernible, blurry mass of nothing. These were seconds to the movies hours, though, so I can't complain about that too much.
The movie was very enjoyable and other than a couple changes that I didn't care for I like what Peter Jackson did with it. Light spoilers for what I didn't like:
Bilbo not coming up with the answer "time" himself bothered me. I liked it more when he realized the answer when he was asking for more time more than Gollum being an imbecile. More than this, I disliked the ring falling out of Gollum's pocket rather than already being on the ground. Also the sleigh lead by rabbits. Ugh, really?
Basically everything else was really well done though. The opening dinner with the Dwarves in Bag End was flawless. Even with the issues I've had with LOTR and this movie I really doubt any filmmaker could have done a better job.
Really top notch.
Also there was this SUPER long preview of the next Star Trek movie which was absolutely-fucking-amazing in IMAX 3D. I didn't have a watch or anything but it was something like seven minutes. Looks gooood.