I'm calling it now that tomorrow's "big" announcement is going to be that the FF7 PC port is coming to Wii U :P

As a platform holder though, isn't it Nintendo's responsibility to secure third party games for their system?

To a degree, but after a point you can only expect so much.  And when third parties are willing to lie about a platforms capabilities (some indie devs, Deep Silver, EA) just to "bow out gracefully" despite the posibility of a big fat lawsuit in retaliation, I think it's safe to say that a lot of it is out of the hands of the company :P .  The only 3rd party games I think they really missed their opportunity to snag are Street Fighter - which was clearly up for grabs - and some key Japanese games that I think they should have ported/localized themselves costs be darned, biggest examples being Dragon Quest X and Star Ocean V being the ones that immediately come to mind as games that are either on the Wii U and need localizing or could easily run on the Wii U and would complement their recent releases well.

And I criticize Nintendo for their design of the Wii U, which is a significant part of the problem.  A year more in the oven to streamline the Gamepad and beef up the system plus secure the launch lineup they admit they really wanted (F-Zero, for example) would have done wonders.  But I'm not going to deduct a ton of points every year for that.  As I said in my post, that's not really a productive conversation :P

And also, I am evaluating them primarily as a first party developer and publisher.  From that front they've done well.  Just not as good as last year, for reasons I stated already. 

Also, for what it's worth, I think that while the Wii U has done a bit worse on the first party front this year they have done better on the indie front than last year with Affordable Space Adventures, Runbow, Freedom Planet, and FAST Racing Neo being major standouts.  And I still think a Nindies Selects series of physical releases for Nintendo centric indies would be wise for 2016. 

Purely as a development house I can understand giving them a 7 for the year.

I personally factor in their performance as a platform holder as well though.

Well I gave them a 4... still not as low as your score I see

But yeah if it wasnt for the out of nowhere success of their new IP Splatoon it would have been an incredibly sad year for Nintendo imo. 
I mean this is the first new IP theyve created that can really move units for generations to come since what, Animal Crossing back in 01.

Bold: And mine's not as low as spemanig's. :P

Italic: Since Wii Fit in 2008, actually. ;)

I dont think that meets my criteria tbh

Im talking multi million sellers, thats why I didnt say Pikmin but instead AC.

To be fair, he did say for generations to come. xD

Wii Fit and Wii Fit Plus sold a combined 45 million and propelled the Wii to record breaking hardware numbers.

It would seem I misunderstood your "generations to come" criteria, but that's a rather arbitrary restriction, especially since Splatoon's ability to move hardware in future generations is completely unproven.

Well the Wii games are hamstringed on principe.  Unless Nintendo goes back to motion control of the same form, they will always be pulled down by the need to own new, extra peripherals.  Splatoon, on the other hand, is not dependent too much on any extra peripheral.  So I think Splatoon I think has a very good chance of being a staple that continues to move units.  The Wii games have much they have to over come that will only get worse the farther from the Wii we go.