The Sims 3 is an incoherent mess of a game, one that requires a large amount of external fan-created patching to get to a functional state— and even with those there's no guarantee that the game won't corrupt a save file on you. That said, it's a failure of ambition, an attempt to create a complex open-world with a large variety of content. Does it succeed at doing this? Not really. Does it try? Absolutely.