"Super Mario Bros." helped sell the NES, "Super Mario 64" was the reason to get a N64, the original Game Boy was initially believed just to be a "Tetris" playing device, and the only game you absolutely needed for the Wii, again at the very beginning, was "Wii Sports."
So to say that original pack-in for Nintendo's previous console was kind of special is an understatement. That and how it sold the very concept of motion-sensing games to the masses. Again, "Wii Sports" is more than a little significant.
And it's coming back for the Wii U, though in a slightly manner than before, along with new bells and whistles.