The Hobbit: The Desolation of Smaug should be retitled to The Hobbit: The Decapitations of Orcs, as it presents another embarrassing example of the MPAA's schizophrenia towards on-screen violence in big, mainstream blockbusters!
That being said, DoS definitely is committed to not making the same pacing mistakes as its predecessor, and it certainly feels a lot more cohesive in terms of its tone. Tolkein purists will probably dislike the film on the grounds that its tampering with the source material makes it much more of a prequel to the filmed version of the Lord of the Rings films that Peter Jackson had made, versus being a straight adaptation of the novel, but I feel like it works in its favor, as An Unexpected Journey tried to be both and never found a good balance. By being substantially less slavish, it finds itself to have a lot more investment in its characters, both previously introduced, as well as its new additions (both from the original text, as well as the brand-new and "brand-new" additions), leading to a multitude of plot threads that command a lot of attention, but never making one more important than the other. Also addressed is the complaint about the action sequences feeling too insubstantial, as the ones on display in the film here showcase a great deal of visual inventiveness while avoiding a lot of the disconnect by utilizing more real world interaction and dialing down a lot of the visual information that led to an overwhelming feeling, making the scenes very easy to decipher and get caught up in. And certainly, they are damn fun scenes to get caught up in.
As it is the second act of a bigger story, it does suffer from not having a real beginning and no real ending (and in this film's case, it ends with one ballsy cliffhanger at that), and there is a sense that the improved pacing did come at the expense of at least one character's fleshing-out, but even as a massive fan of the original text, it was hard not to find myself engaged the entire way through. The film ends in a rather surprising spot, with a lot of balls up in the air for Jackson to catch, but if this film shows anything, he may yet be able to catch most of them.