So much hate for the Purge.... yeah, it was full of plot holes, yeah, it makes no sense economically or otherwise, and oh my god "it just works" was idiotic, but I really think the movie had its merits, even if creativity or plausibility weren't one of them. Slight spoilers ahead.
Some scenes seemed very poignant to me, like the imminent rape scene by the sleazy neighbor guy. His character was done so well. Rejected, day after day, the object of his desire almost within arm's reach, passing him by like the worthless human being he is. And he knows that, and he knows he can never have her, and the way his mind twists to justify rape is so believable. He has her, he's armed, he's won, but still he feels the need to shout out to no one in particular, "It's my right! I earned it!" or something like that... still trying to justify his crime in his eyes. I don't know, but as horrific as the scene was, it was done so well.
So, while the Purge fails at being a good movie, I think it makes for a more-than-adequate thought experiment and setting for a few decent scenes.