Bought my 3DS for Tales of the Abyss and the vast majority of my 3DS titles are 3rd party, so no I primarily bought my 3DS for 3rd party games. As for wii U? Bought it for operation rainfall, X and Shin Megami Tensei X Fire Emblem, so I guess that's practically like buying it for Nintendo games even though the two Wii U games I own for it right now are not Nintendo games.