The Purge: Anarchy (2014)
Caught this last night and was amazed how much I liked it (then again it could have been the cider or further proof of my brain damage).
The first one failed because they just turned it into a typical home invasion film. This was a lot better as we got to see more of the big picture. When I first heard of the concept I wanted to see the Purge as a threat from the inside - have it show coworkers, family and friends turn on each other (and we did get to see a bit of this).
I would have liked to see the results of a failed purge too. It would be funny having to deal with a coworker who tried to murder you in a previous event.
If they do another one they need to go full exploitation and up the violence and embrace the grindhouse spirit.