If there is one thing that bothered me every now and then, it was the lack of an original score. I understand that for some parts, using the same score as used in the LOTR movies make things recognizable. But it also felt slightly... lazy, perhaps?? Not sure what word to use. It still is a great score, don't get me wrong.
There is nothing lazy or unoriginal in Howard Shore's score. The amount of layered detail he includes, the way he provides variations on familiar themes, and the way he weaves them with new themes are all done with high levels of intent and skill. The score is meant to sound familiar because this is the same world, including many of the same locations and some of the same characters, with which we lived for three previous movies. What other theme should he have used when introducing the Shire, Gollum, Rivendell, the Ring? There are plenty of new themes and motifs, too - some of which are still being developed (recall that the Gondor theme made a brief introduction in FOTR but was mostly unnoticed until it played with full fanfae in ROTK).
On another note (pun intended) I saw the film for a second time yesterday, this time in 48fps. I have to say I loved the clarity, but I never got used to the jerky movements of the characters. Even at the end there were moments when they seemed to be moving cartoonishly fast. Very distracting for me. Not sure what the solution is - if it's just that I need to see it more often to become more accustomed to it, if the movie needs to filmed differently to accommodate the different perception, or what. I'll watch 48fps a few more times, but unless I can get past that barrier, it won't be for me - regardless of how beautifully clear the film looks.