I saw it and later bought it, just because I am a huge Hobbit/LotR fan. I was somewhat disappointed that it was FAR less faithful to the books than the LotR trilogy. (bout to get spoilery up in here, just in case you haven't seen it.)
Azog and Radagast are barely mentioned (just in passing) in the book. Here Azog is made a main antagonist and Radagast is given a much larger role (though I did find him amusing, so...) The whole thing with the Radagast, the witch king, the blade, and Saruman (who never appears in the book - he is soley an LotR character). - none of it int he book. If this stuff comes from Tolkien's supplementary works, that would pacify me somewhat, but as it is, AFAIK, ol PJ just made them out of whole cloth, which is a bit irksome.
Still, looking forward to parts 2 & 3 as they come out.