User Generated Content has been around a long time, DoTA for Warcraft 3 is so popular that they are releasing actual full games based on that by the DoTA creators. Before that there was the FPS PC game, ah i can't remember the name of it. It has been very very popular on the PC side for ages. But I don't believe there was ever a crappy game that had great UGC.
We already have UGC on the Wii, The Check Mii Out channel, your authoring tool is the Mii creation channel and you enter your Mii's either to show off your creation or to enter in weekly contests. Theres also the Everybody Votes channel, but that is kinda crap. But these are more towards free and 'fun' past times.







