Why do people continually call Skyward Sword the worst selling 3D Zelda game?

[IIIIITHE1IIIII]

Majora's Mask sold 3.36 million copies while Skyward Sword sold 3.96 million.

Nintendo 64 sold 32.93 million units while Wii has sold over 101 million.


Although Skyward Sword technically sold more you have to put things into perspective.