Absolutely love it. It has some issues but for an alpha version it's really well done.
Even though I have only played twice, due to personal and others real life issues, I had a lot of fun and definitely looking forward to the next session.
Only the right side of the map (Altis) is done but it has a LOT of places to visit.
Pros:
You can do what you want, with consequences.
It's up to you to decide the story, each time is different.
Lots of places to visit.
Really scary. From 1 to skeleton it's a spooky scary skeleton.
Cons:
Civilians are a bit buggy, crawling and crouching randomly, funny to see but it distracts a bit from the gameplay.
Sitting script is not working yet. Makes the game unplayable. (sarcasm)
Can take some time to set everything up correctly, but real life plays a big role in this issue.