This surprises me... not even a little. The Wii U was basically an exercise in how not to handle a console. Which is a shame because at its core, it's not a bad little machine, Nintendo just made too many dumb decisions. Hopefully they've learned from their mistakes.
That said, when I look back on the Wii U, there really aren't that many experiences that stand out. Sure there are great games, but with an exception here and there like Splatoon, SMM, Pokken, and... uh... maybe Platinum's contributions, it really just seems like more of the same. I wouldn't say the quality has dipped (other than in this last year which I attribute to Nintendo leaving the Wii U high and dry for the sake of the NX), but I would say the creativity and innovation has. Nintendo didn't exactly shake things up with the majority of their titles.
Hey, here's another SM3D, here's another NSMB, here's another DKC, here's another Canvas Curse, here's another Starfox 64, here's another Kart, here's another Smash, here's another Mario Party, here's another Zelda remake. You want an original Zelda? Well we put a very nice coat of paint on Dynasty Warriors. Pikmin, Woolly World and Xenoblade as well, but I won't whine about those as much since it had either been a while since we got a title in those series, or because the series was relatively small anyway. Though they also were by no means game-changers.
I'm aware this is in no part a trend exclusive to Nintendo, it's just that usually they seem a bit better than that, at least in the fact that they'll even out their straightforward sequels with more experimental, innovative, or divergent affair.
Radiohead put it best: "This is our new song. Just like the last one". :/
Here's to more breaths of fresh air like Splatoon with the NX, hey?