Do Wii U owners feel disappointed?

[midrange]

Yes, I am disappointed.

1) I bought a wii u thinking that it would at least have smash bros and mario kart 8. Smash bros does a great job in balancing the competitive side and the casual side while adding plenty of content. Mario kart 8 however feels like a downgrade (not only does the gameplay feel the same as the wii version, but the local multiplayer has gotten worse)

2) I bought the wii u under the impression that it would have decent third party. In 2012 this launch plan included zombiu, Rayman legends, lego city undercover, and wonderful 101. That's 4 third party exclusives!!! Not only that, but crysis 3, arkham origins, injustice, dying light and aliens were all in the works to make full use of the wii u along with the definitive edition ports of nfs, deus ex and darksiders. Now the Wii u only has a small dlc for skylanders as its exclusive third party offering ... Pathetic.

3) if I don't like a new release (splatoon, mario party 10, etc.) It's really sad that I have to wait months before another game (that I may not like) releases.

Just like Nintendo's recent e3, I had very low standards for Nintendo this gen, and even then they managed to disappoint me