Picked this game up on sale a few years ago and finally got around to playing it. I've put about 5 and half hours into it and can honestly say, there is nothing special about this game. Its very buggy, and lacks a lot of content. For instance, enemies frequently are shooting me while facing the opposite direction, and I've been spotted through boulders while sneaking into an encampment. Stuff like this should have been fixed years ago.
I think it's generally a competently made game, maybe a little rough around the edges. It feels a bit clunky, but I liked the overall aesthetics and sound design.
However, the gameplay fell short for me. It's sold as a sniper game and the sniper rifles are meant to be your main weapon. But the actual sniping isn't much deeper than in many other shooter games. The general gunplay is fine, but I did expect more than an arcadey shooter. It doesn't even matter much if you miss, since the enemy AI is as dumb as a bucket of sand.
I could still enjoy a game like that, but there's also the checkpoint system. I generally don't like checkpoints in shooters, but this one is especially bad. While it's an open world game, there seems to be a fixed respawn point for every mission, outpost or village. It doesn't matter from where you originally came. At frist I tried to plan my approach according to the terrain, but as soon as you die once, this is completely in vain. Often the game will respawn you next to the ideal sniping position anway.
In the missions I played there were also no checkpoints during missions. You always have to succeed in one go. I managed to put up with this for some time, but finally gave up. There are simply better games that require less time.