I honestly think the biggest mistake Nintendo made with Wii U, was not showing their own major software titles until AFTER the system released. This is what get's people excited for Nintendo consoles, and Nintendo, through two E3s, did nothing to help that. Completely unprecedented for a Nintendo console unveiling. Not the only thing, mind you, but a huge reason Nintendo didn't pick up much momentum with this system.
Even then, what they've shown isn't all that impressive anyway, with Mario Kart being the only exception.
While I don't enjoy the mainline Mario games very much (feel free to throw tomatoes), I've always held a great deal of respect for them, and was always wowed by what I saw. Back in 2011, when the Wii U leaks were first coming out, I was crazy hyped to see the new HD Mario. The next step from Mario Galaxy - something with the same jaw-dropping scale, atmosphere, music, and visuals. Fast forward two years and after all the wait we get... Mario 3D World. Will it be a solid game? Oh, I'm sure. Is it impressive or eye-catching at all, or even in the same league as Galaxy or 64 when it comes to significance? Not in my opinion, no. Not even close.
The new Zelda game, then? That tech demo looked pretty awesome. Anything like that? Nope.
Pikmin is Pikmin. Donkey Kong is Donkey Kong. Smash Bros is Smash Bros.
Maybe I'm not a good judge seeing as how I'm not a Nintendo fan anymore, and their output isn't as exciting as it used to be for me. Maybe I'm just cynical.
But honestly, all I'm seeing is the same stuff they had on the Wii, but with a new coat of paint. New game mechanics are a given, and something I take for granted. Sequels
need that. It doesn't make me drop everything and say "okay, this is way better than what we had before. I NEED this".
InFAMOUS Second Son has a new main character, a new overworld, new powers, a new story, far more impressive visuals, and so forth. I didn't care much for inFAMOUS 2 (never finished it), but I'm really pumped for Second Son.
Mario 3D World has transparent tubes and a cat suit.
Whooohooooo...
To tie this back to the thread and keep myself from going off topic, this is a big reason why the Wii U isn't selling - their first party captures their core audience's attention, and nobody else. With nobody else buying, the userbase stays exclusive to Nintendo die-hards. Historically, these are the people who don't buy third party games. You can see this trend in
this very thread. Small install base of people who won't care about your games anyway? Yeah, I don't blame third parties for ignoring Nintendo.