I've actually been lucky enough to play around three hours of Just Cause 3, and I had a really good time with it. It seems to be the logical progression for the franchise, building on the great ideas from the last one.
You can see a very sizable chunk of what I was privy too, right here though. Avalanche have released the first hour of gameplay, showing off the introduction to the story of the game. You can really begin to see the first act take shape throughout this video and the kinds of missions the game will have you doing.
Take a look here: