To my understanding, the Wii U is similar in capabilities to the Xbox 360 and the PS3. Why is Destiny being released for those consoles, but not the Wii U?
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there's no market for it, Bungie would then have to learn exactly how to develop a game for the Wii, and most probably, Nintendo didn't even attempt to get it developed for the Wii U. After the gamecube, Nintendo gave up on third party games. I still think they can rock it with some of their first party franchises, but there's honestly no reason to actually have a Wii U besides Mario, Metroid, Zelda, DK, or because you have a child in your house.