The post-apocalyptic world of Fallout 3 makes the current state of the worldwide economy look about as pleasant as apple pie. Bethesda rendered the bleakness of a nuclear bomb-ravaged Washington DC with the perfect amount of despair and, given the nature of the franchise, humor. From the moment you step out of Vault 101, you want to explore every single bombed-out shack and collapsed building. The radioactive wasteland is filled with incredible detail, and the long draw distances practically beg you to wander around by giving you so many landmarks to march towards.
Fallout 3 is based on the Oblivion graphics engine, but runs much better than Oblivion and with greater detail. However, even with the engine performance improvements, you'll most likely need to upgrade a system component or two if you want the game to run at maximum quality settings.