I got this film yesterday and I absolutely loved it. It is very different from the other films and even the book but great animation and music made up for it by far. I especially loved the scenes with Frodo and Sam in orc clothes walking with the other orcs in mordor and also the fantasy dream scene with the smiling orcs coming towards Frodo and Sam showing the middle earth that could have been.
Also I loved the main theme song "Frodo of the nine fingers" I just can't get it out of my head.
I found the opening quite well done despite the fact that it's not in the book or the other films. The fact that there is a lot of new things in this film is by no means a bad thing if you keep an open mind. So sit back, relax, shut up and enjoy the music!