I played Fallout 3 for 2 weeks - from April 29th until May 15th. And I'll never play it again.
It's a dreadful mix of "The Hobbit" text adventure, D&D and the long-standing sci-fi tradition of a futuristic, but post-apocalyptic, wasteland filled with pop-culture references. The dialogue varies from the odd to the implausible, the characters all wander around with no real heed to each other (watching them just endlessly walk into each other, because one MUST go that way and the other MUST go the other way, almost never gets old), it's supposedly "huge" but, just like GTA4, is really a very linear game with lots of disparate locations spread very far apart with giant gaps of jobby all in-between, and the bugs... OH, the bugs... It's like no-one ever playtested the damn game.
So I rocked up my Platinum and sent it back. Horrible, horrible game.