It's no secret Nintendo mostly uses an art style that resembles animation (Western Cartoons and Anime). However, some people have a problem with this and would like Nintendo to make something more inline with the realistic looking graphics seen on Sony and Microsoft platforms, that have become an industry standard.
A likely argument by some would be because it adds diversity. However, I don't buy this. There are a wide variety of cartoony art styles to use like a saturday morning cartoon, shonen manga, shojo manga, western comic books, general anime, surreal style, storybook style, painting style, or even stick figures. Nintendo games use a wide and diverse variety of art styles, while still sticking a central animated feel. You can be diverse, while still being cartoony.
A likely argument by some would be because it adds diversity. However, I don't buy this. There are a wide variety of cartoony art styles to use like a saturday morning cartoon, shonen manga, shojo manga, western comic books, general anime, surreal style, storybook style, painting style, or even stick figures. Nintendo games use a wide and diverse variety of art styles, while still sticking a central animated feel. You can be diverse, while still being cartoony.