spore kind of
I summoned this guy to post Spore, but he was pretty much ignored and the topic died.
Wow, I can't believe nobody posted Spore! Dude, when you look at it as a whole, it's a huge game -by that I'm not boasting about its quality; the game harbors a lot of complex information at a time- that focuses more on user created content than most other games I know.
The community has already created
one hundred million instances of user created content.
And there isn't even any absolute, definite goal to the game. Some consider more than a game, but something along the lines of a toybox, much like Maxis' other titles of simulation games that usually don't present familiar, conventional means of simulation.