Soooo I've been blowing off a LOT of time playing the post-apocalyptic survival-horror FPS
Metro 2033.
This is an epic game based off of the novel of the same name, despite some wonky, unrealistic too-perfect human AI enemy behavior:
http://www.humblebundle.com/5 days left to get it (and a horde of other THQ works) for as cheap as $1! I paid $6 and sent it all off to charity