This. I don't feel bad for anyone who claims "spoiler" about the original plot of the book. Yeah don't say anything about the movie maybe, but I mean come on, hearing the necromancer is sauron, no shit read the book. Its great. Plus if you didn't want to read spoilers, why the fuck did you click on this thread?
On a different note, i do wish it was more like LOTR, it would have been great to get the same gritty dark style. In the sense that it was more... childish I guess. However, I think it reflects on how the book was, as The Hobbit had jokes and more songs and was more playful than the LOTR. I liked it overall and realized I need to read the book again. Should be interesting to see how PJ can drag this out into 3 movies though...