The Hobbit: The Desolation of Smaug

Peter Jackson's second installment in the trilogy he is managing to wring from a combination of Tolkien's novel and his own imagination is an amusement park ride of a film, a two-hour-and-forty-minute journey that entertains you and then deposits you outside the theater, unchanged except for the passage of time. 

This middle entry advances the plot in basically one key way (spoilers):  All the bad things are now winning.  At its end, our dwarves have failed, Gandalf is a prisoner, some new friends are about to turn into dragon crispies, and, as you might guess from that comment, Smaug is flying the Middle Earth skies, and, boy, is he pissed.  In the course of taking us to these places, Jackson keeps the pedal to the metal and avoids the boring stretches of the first film. 

I enjoyed this movie, even found it satisfying enough as an adventure, but I wanted to care more than I did. 

I can't imagine you don't already know if you want to see this one, but if you're on the fence, wait until you need a few hours of mindless film adventure to relieve the stress of your day, and then check it out.