So much could be said about “The Hobbit: The Desolation of Smaug” it’s difficult to know where to begin. But in that statement itself lies a point which shouldn’t go unsaid: “Smaug” is an epic movie so dense with story, artistry and effort it deserves praise purely as a filmmaking accomplishment. The film clocks in at 161 minutes but, unlike “An Unexpected Journey,” it rarely drags.