Anyone who enjoys Fallout 3 (and has a PC) should check out STALKER: Shadow of Chernobyl - it's a harsher game and a rougher one but when used with the
STALKER COMPLETE mod, it's one of the most atmospheric games ever made and a personal favourite.
Here's a montage from the first and (not as good) second game:
I love just wandering around in this game.
EDIT: oh and FUUUUUUUUUUUUUCK YOOOOOOOOOOOOOU and welcome to the forums.