Adds just enough of a social aspect to keep me gaming nonstop for hours.
Can add infinitely to your gameplay, and sometimes they even alter huge elements to were it is nearly a different game altogether. Ability to load mods, make mods, share mods, mods mods mods. I have no evidence to support it will be prettier than on the PS3, but if you have a sweet vid card and force 8xAA, I 'assume' it CAN look prettier.