The Purge

Given the country's overcrowded prisons, the U.S. government begins to allow 12-hour periods of time in which all illegal activity is legal. During one of these free-for-alls, a family must protect themselves from a home invasion.

Reviews:

http://blogs.indiewire.com/theplaylist/review-the-purge-is-a-provocative-and-subversive-home-invasion-thriller-thatll-be-sure-to-give-you-the-willies-20130604

http://www.ft.com/cms/s/2/b2ff72e6-c90a-11e2-9d2a-00144feab7de.html#axzz2Urgq7KCH

Apparently, it's actually good.