Ultra heavy conceptual work of dark genius.
Fallout 3 rules. This is Oblivion with guns. This is the next level of RPG and FPS action crossover. This is simply superb to say the least. I would hammer a 10 out of 10 for it if it wasn't for the steep system requirements.
Being a fan of the series, I may be overreacting a bit. But I will promise that I havent' for one second played less than 3 hours a session a few nights in a row, and have only begun to graze what's before me.
The story, characters and quests are vast and epic. The violence - brutal as hell can get. After all, it is pretty much the end of the world. No game has presented hell in any better way. If you're a fan of the series, you are mad not to get this game. If you are new to the Fallout world, this is going to be the best gaming experience you have ever had.
Otherwise, go and play Fable or something.