It had a lot of potential, but the message they were trying to send wasn't very clear and the whole home invasion was kinda stupid. The purge itself was not very well thought out, as it would not work. The economy would not be booming after several years of letting people run wild for 12 hours murdering each other. You would not trust anyone, and society would break down. Not to mention the fact that everyone would go broke trying to rebuild each year. The end was just f-ing dumb.