My family enjoyed it the first time in 3D but my son and I watched it 2 weeks later in 2D and really liked it better. There is just too much to see in 3D so you don't really get to enjoy the acting and story. The fight with the giants and the fight and chase with the Goblin King are particularly better. This movie is better each time you see it and you catch more nuances...awesome movie! The additional scenes from the book are justifiable if you know the Samarillion. Spoiler that the Necromancer is just Sauron in spirit form before he gains enough strength to decide on a form (the all-seeing eye) of LOTR.