One of the best games around for the PS3. It is one of them games where you can pretty much do what you want. If you want to go and exploir the world you can. You want to murder some random people you can. You want to steal some stuff and sell it for cash you can. If you liked Oblivion you will love Fallout 3.
You should get at least 100 hours worth of play out of this game. Plus it has 4 DLC expansions available to buy from the PSN store.