M-E-D The Poet said:
although I must say I personally did enjoy the movie as it was with the added quest for erebor scenes (those are what most of the padding is meant to be although not completely true to the book itself for we've not seen Gandalf meet thorin in the pub but that may be in the extended cut)
You know, I'm just going to
SPOILER ALERT this whole post rather than putting the whole thing in tags.
The opening sequence about Smaug's arrival at the lonely mountain was great. It was something the book lacked, in fact, in that it immediately established a motivation for Thorin and his company. Better, it did so visually rather than simply explaining it through expositional dialogue or a voiceover. That was a very welcome addition and I wouldn't consider it padding.
The whole reference to Moria and the conflict between Thorin and Azog was entirely unnecessary, in my opinion. The flashback is completely out of kilter with any of the previous scenes and clearly there to tick off a battle scene. I get that he's there to provide a named antagonist, but he's not interesting enough to pull it off.
In the book, it was the goblins who chased the dwarves with the wargs after they escaped goblin town. In the film, it's Azog. Last time we saw Azog was in the lone lands, so somehow he's crossed the Misty Mountains and perfectly located Thorin and company minutes after they hit the surface. That's.. weird, when you think about it. It would have made much more sense to use the goblins.
Additionally, I spent the entire movie waiting for him to die off at the end only to find he didn't. I assumed that he was there to provide a clear arc which would help the movie stand on its own as a story (which is cool, it kind of needed that) only the story wasn't resolved.
His role could have been entirely replaced by adding more scenes with the Goblin King and fleshing him out as a more credible threat, perhaps adding a few goblin lieutenants and and you would have lost nothing, stayed truer to the book and made a shorter movie.
Finally, the Necromancer/Radagast plot. Okay, the Necromancer is simply there to tie the events of the hobbit in with those of Lord of the Rings, but it's entirely non-essential to the plot. The plot has an overarching antagonist, it's a big-ass dragon (and a goblin army), we don't need to somehow tie everything back to Sauron. Now, I can see how it could result in some interesting scenes and I like Benedict Cumberbatch and am certain he will do a good job, but even assuming the pay-off is incredible there is simply too much exposition and foreshadowing in the first movie and it never really connects to the main story. It could have been cut down substantially to just a few establishing scenes and we would have lost very little.