Ghost Recon Wildlands is Ubisoft's open-world tactical shooter where you and a couple of buddies can join forces in order to take down an extremely well funded drug cartel. If you don't feel like playing with other people, worry not as there are also AI followers available, but I'd still heavily recommend playing it with friends as its much more enjoyable that way.
In order to commemorate Ghost Recon Wildlands' full release Ubisoft has unleashed the newest and most likely final gameplay trailer. So if you're interested in a brief look at what Wildlands has to offer, here's the video:
I haven't played the full version myself, only the demo, but from everything I've seen so far Wildlands is a competent, albeit slightly unoriginal open-world shooter. If you've enjoyed some of Ubisoft's most recent games then chances are you'll enjoy Wildlands as well. Just make sure you're not grabbing it purely because of the "Ghost Recon" part of the name as its a lot simpler than the previous entries in the series, though don't take that as an actual complaint. Wildlands isn't really better or worse than the previous games, its just different.