Because in many respects it's true. Zelda and Mario use a lot of the same concepts, gameplay and formulas for every one of their major games. Zelda dungeons have a lot of repeats: Forest, Ice, Water and fire dungeons have been used several times over in Zelda games. Same z-targeting system in 3-D Zelda's, several of the same items and the storyline doesn't generally change much at all. You always seem to get either the boomerang or the bow and arrow during the beginning too.
Super Mario Sunshine however was something new and refreshing I'll admit because of the water pack, however you still collected stars in a linear fashion just like SM64 and SMG.
That doesn't mean anything bad or good. It just depends on how you look at it.
This will only take a moment of your time. *steals your watch*
