It's really strange to say how smart these movies are. They take the shock/gore genre and inject it with an actually thought out governmental story line that combined with the psychological mind screw of thinking about the premise and make a legit good movie even with the crazy over the top gore and violence. To think that this franchise is now three movies deep and that they are actually getting better/smarter is an even more impressive accomplishment.
I would absolutely recommend anyone who is a fan of the previous entries check this out. It's a good watch just like the other two and manages to take your brain to a place imagining that this world actually exists. Just remind yourself afterword that it doesn't so you don't kill someone in the parking lot on your way to the car.