Fallout 3 is an action RPG from Bethesda that's been a big hit with fans and critics. It won several Game of the Year awards and has a loyal following. It's the third (hahah, duh) in the Fallout series that takes place 36 years after the adventures of Fallout 2.
You are an inhabitant of Vault 101, a survival shelter designed to protect peole from the horrors of the nuclear fallout from 200 years previously. You have been forced to leave the Vault to find your father who went missing somewhere in the ruins of Washington D.C.
The game sold over 610 000 units in the first month of release and has had five downloadable addons released since October 2008. If the RPG genre is something that appeals to you and you haven't explored this world then you should definitely give this a try. Actually it's worth playing even if you've not quite formed a deep love of the RPG as it has merged the FPS and survival horror genres into the gameplay.
Thanks to SUPERCOOLWILLOW at HUKD!