I had no problems with the fps nor 3D - expect perhaps older movies to appear "jerky" and "fuzzy" from now on. No idea why the prescreening audiences were so critical about the experience, perhaps it's just a cultural artifact, how a movie should look and feel. Coincidentally there have been reports about an entirely vectorized video format having been developed so even this technology might soon face obsolescence with "pixels" relegated to mere display parameters.
As to the content, it seemed heavily weighted towards action and general running, fighting, falling, burning, crashing, hurling, swatting, swiping, ducking, sliding and flying about. All of this accompanied by persistent noise, to a point where it became overbearing and well, to me at least, wound up above and beyond the pain threshold. The monsters and the indiscriminate killing thereof were highly, tortuously, detailed and very graphical in a not so slight dissonance to how gullible, childlike and even human some - if not most - of them were portrayed. All the more poignant compared to how Gollum, who has genuine (multiple, the other truly evil) intellect, was to be spared in the pivotal twist of the plot (rather than a sword, that is). Gandalf, in turn, at times seemed almost apologetic about his prescience and ability to get the dwarfs' plus Bilbo's posse out of any trouble whatsoever, begging the question whether much of their effort and of the risk was really necessary to begin with.
Now, I don't mind portrayals of violence in movies but this just seems so ... triangulated between Jackson's other work, namely "LotR", "Bad Taste" and "Tintin". The themes that repeat are gore, franticness and epic proportions. Those and the cutting edge technological embellishments that are (given his resources) absolutely state of the art. Perhaps Jackson, in an effort to confront his own demons, obsessively brings them as close to life as possible - only to dispose of them in a way that often approaches slapstick (.. see, nothing to fear there?). Often the results are otherwise interesting to behold but w/o much personal or emotional investment carried over to the (this) viewer.
In many senses it is a grand journey (or at least a third, ninth or whatever fraction of it) but therein I felt relegated or typecast into the extraneous role of a tourist rather than experiencing anything approaching visceral, introspective or revelatory. Nothing especially wrong with that, it's just what it is.