The 360 and PS3 have their share of games like this too, however I think this is probably the worst marketed aspect of the other two consoles. Both have quite a few fun downloadable games that are quick to pick up and put down, and play with friends. They don't advertise this much at all, and since no box sits on the store shelf, most people simply see all the Wii games that appeal to them.

Nintendo did a great job this generation on returning gaming to the "fun" part and marketing it to a wide audience, while Sony and Microsoft were over in the corner making systems for the existing install base.