Lincoln - in this biopic, miserable hack director Steven Spielberg, who yearns for respectability so badly it's killing him, misrepresents Abraham Lincoln as the first Hollywood liberal.
Django Unchained - one slave's payback is a pitiful feelgood substitute for a depiction of a general revolt, but any such depiction would have to show the resulting retaliatory massacre to be the least bit historically plausible, and that's just too grim for a movie.
Zero Dark Thirty - torture or no torture, an exciting suspense film celebrating extrajudicial murder is not a great idea. The "hit" punished a crime that had a zillion lingering questions instantly put to bed when the snuffing took place.