Not to bust your bubble but all the pokemon games.have outsold UC4 and Mario Kart 8 was at 8 million a few months ago. So its the 5th best selling exclusive. Still good though.
Well since you included handheld titles, New Super Mario Bros 2, Super Mario 3D Land, Animal Crossing: New Leaf, Mario Kart 7 have all sold over 10 million.
When the herd loses its way, the shepard must kill the bull that leads them astray.