Nintendo may not design their games to be "artsy" (what an ugly word), but more than often they turn out that way anyways. This way they have a very good gameplay with awesome art design as an extra bonus. Just look at Skyward Sword (best effect on Dolphin T_T) and Pikmin3 for some recent examples. Especially Pikmin3.
Games being artsy just for the sake of being artsy may be conceived as being pretentious, by designing the games around the gameplay first Nintendo avoids that risk. (Not to sure how Kirby's Epic Yarn fits in my interpretation, though)








