I remember reading some time ago that Minesweeper and Solitaire were deliberately chosen as the preinstalled games on early Windows computers because they would teach users important skills for interacting with a mouse - Minesweeper for left/right clicking and Solitaire for dragging and dropping.

Wii Sports played that exact role for the Wii and the Wiimote. It enabled players to get used to the new hardware quickly, and more importantly - made the process fun. It's obviously not as polished as more recent games, but it's actually still good fun to play today and that's all I can realistically expect from it.