Fallout 3 gives you an immersive world and addicting gameplay with annoying bugs and a broken storyline.
You play as a guy/girl that has had a lovely time in a Vault years after a nuclear war. You have a loving father, a best friend, and a bully always pissing you off. Then out of the blue, when your 19 years old, you're forced to give that all up and you're dumped into a nuclear wasteland. You are then forced to deal with it. You can allow this series of unfortunate events in your life to cause you to become utterly evil, or you can fight for the common good.
Fallout 3's game engine is superb as is the world you play in (Washington D.C. and surrounding areas). I always found myself fighting my way towards the end of a quest or to the next settlement, unable to leave the computer until I did. Following the plot was one of the things that I didn't rush and it was a good thing too. The basic plot unfolds the same way no matter who you are (good/evil).
I loved the game utterly until I finished the plot and sadly now it's kind of dead to me. I just feel as if the player is completely shafted by the end of the game.
*SPOILERS*
At the end:
If you're evil, you live evil.
If your good, you're a hero, but you die a hero.
And either way, the girl you are best friends with and possibly love banishes you and you never see her again, your father dies, and the game ends after the final quest no matter what your fate is.