Mario Kart 8, A link Between Worlds, Super Mario 3DWorld, Pikmin 3, Luigi's Mansion Dark Moon, DK Tropical Freeze, Smash Bros 4, Fire Emblem Awakening, Super Mario Maker, AC New Leaf and Splatoon had been pretty epic to me
Others I won´t called them epic but are pretty damn good anyways, like Captain Toad, Yoshi Woolly World, Hyrule Warriors etc, also Nintendo made possible that Bayonetta 2 was released on WiiU and that one is fucking epic.
And for the love of God you are going to get one of the most ambitious games that Nintendo has ever done just next month, Xenoblade Chronicles X, that, my dear soulmate, is the definition of epicness made videogame.
And next year we know they´ll release Fire Emblem Fates, #FE, Pokken and Zelda U, that could easily be the most ambitious Zelda ever, and that is only a piece of the anouncements we´ll have once NX is revealed, they probably have a bunch of epic games in development right now that will not be released on the WiiU because they just cannot afford it for such a low install base sadly. They were overwhelmed for HD development so they have been more slow delivering the goods, but they have delivered a good amount anyways and that problem is gonna be over soon, they should be feelling way more confortable with HD development already.