Most atmospheric and thrilling game I have ever played.
For the first time, I felt like I was in the swamp. For the first time, I felt like I was shooting from that rifle.
This game, not only is it amazing, but it gives you its best, and doesn't let you turn off you computer until you've done absolutely everything. Not only is it's gameplay brilliant, and realistic, which I highly appreciate (for example, you bleed when you get shot, and that can only be stopped with bandages, otherwise you're dead), but it's story is fantastic as well.
I have to admit, this is one of the best games that I have ever played, and the S.t.a.l.k.e.r. series has always been a shining gem among the FPS games, and I'm pretty sure the sequels will keep that tradition going on, hopefully for a long time!