I somehow doubt that Wii Music is the Ultimate Videogame, there is no such thing. The Ultimate Videogame would have to be fun and engaging, or at least exciting, for everyone and have some purpose or deeper meaning along with more shallow values for the more easy going crowd. And then there's replay value or lasting appeal, which these games rarely possess in any color or form in my experience. (In fact; most games have very limited lasting appeal)
One single game will never cater to everyone, we're too different. And thank god fot that! 







