Fallout 3 is an awesome game with a ton to do. They based off a lot of it from Road Warriors (Mel Gibson movie).
Fallout 3- i personally hate it. I would reccomend Elder scrolls IV: oblvion (by same devs) as it is Same game engine Same Developers Different setting Is all, but medieval is so much more fun than post-apocalypse.
Finally picked it up for $27 at super target, I also bought the Add-On Expansion for 360 (included 2 whole DLCS) for only $3 at super target. What a deal. Im loving this game. The story is very good and makes you want to keep playing just to find out why poor old Dad left the vault. Its not really so much a "run and gun" game play type of game, yes its a 1st person perspective, but also a 3rd. The gun play is clanky, its meant to be played more like an RPG then run and shoot. Lots of choices to make, you can pour hours into this game
Great game, one of the best, definately, get it. Though, if you have money, I'd recommend getting Dragon Age Origins instead, way better, although they are a close match =)