Fallout 3 is just one of the best first person RPGs ever made.
The graphics and game play are fantastic if you got the machine with the ass to run it. If you don't have the machine to run it the enemies won't render at a distance but they still can shoot you.
The story is gritty and very deep as you explore the wastelands of a futuristic art deco Washington DC wasteland.
The game is huge with months of game play. Its so big that you wonder how did they have the time or budget to make a world on a massive scale.
If your looking for something to take up far too much time then F3 is the game to be.