If Nintendo had Pixar make their movies while maintaining control of the property so another "Super Mario Bros." live action fiasco never happens again, they could make some really awesome movies. But if Nintendo teams up with some companies in Japan that did the live action death note or attack on titan movies, this could lead to some huge flops.
Sources:
http://icv2.com/articles/news/view/34515/nintendo-plans-self-fund-movies-videos
http://kotaku.com/nintendo-wants-to-make-movies-1777033924