The Wii was developed from every angle to be a brand for casuals.
Don't get mad if some developer basically just said what most them think.
What "hardcore" games on the Wii put up monster numbers relative to the size of its userbase (being significantly bigger than PS3 or 360?). There were some decent exclusives like GoldenEye and Monster Hunter Tri.
Fact is there is a big portion of the Wii userbase that simply just buys fitness/party/dance/shovelware crap with the odd Mario game thrown in.
Even with Nintendo, they've had trouble selling more core centric IP not named Mario on the Wii (to the point where they only gave Xenoblade a limited release in the West and just bailed on The Last Story entirely ... why? Because they know there's no market on the Wii for these types of games).
I don't think Wii U changes the equation that much.
