The visuals on this movie are simply amazing.
Yes, it is long and dragged out (you have to expect that when 1 book is turned into 3 extended length movies) and yes there has been extra story added in (I won't detail that so I don't ruin it for anyone who hasn't seen it yet) but that all flows together well, and as mentioned it looks incredible.
That was the main reason I bought this, and in the 3D. The visuals, the scenery, everything is so detailed and so perfectly done, it's just pure eye candy. Worth seeing for that alone.