I ended up going back on my original plan to get damn near everything on PS4 and switched my reservation on this(and Dead Island 2) to XBox 1. Hopefully the update is more likely Tomb Raider and not Halo.
Oddly enough I've never played a Just Cause game. First one slipped under my radar and the second one came out at a time where I was so behind on playing games I had already bought that I couldn't really justify buying another one. Definitely interested in this and may end picking it up after the holidays.
At this point I'd tell anyone to just go with 3. 3 does everything that 2 did and then some. 1 is like Sandman said. Skip it.
To be fair, I did get the first one cheap prior to 2 coming out, and I'm a little OCD about wanting to play games in order and at least try to play a game if I bought it...hence why I am so far behind on so many series