Who stole the last reel?

Rating: 8/10 (26 December 2013)

Desolation of Smaug~161 min. Erm - there was over 30 minutes of ads and trailers in the screening I saw. The start and finish time would have meed it impossible to see any ads or trailers. So who stole the last reel or did it go missing? or are the running times being reported in error?
Does it really end mid scene or is it simply a cheap editing tactic to lure us back to the next instalment? So many sub-plots left hanging and not much in the way of depth of character development.
There are some amazing aspects to HFR 3D but the narrative seems to lose out to the the stunning VFX, tasteful sound track and great sound design.