Despite only making it about 6 hours in, I really enjoyed Fallout 3. The story is great if not totally original, and the gameplay is unparalleled in depth. If not for the exhausting run time I'm sure I would have completed it, someday. Thankfully, Bethesda is not just content with making a never ending game for their fans, as they are spending tons of time pumping out DLC for the game. Their latest addition, "The Pitt," sounds pretty gnarly so far:
From Wikia: