I don't think Nintendo is rushed by time but rather has many of the A-Team members working on the NX. Many of them wrapped up work on Wii U projects in 2013/2014, with some exceptions (Monolith - Xenoblade X, Atlus Partnership - Tokyo Marage Sessons, 2D Mario Team - Mario Maker, Animal Crossing/Mario Team - Splatoon, Good Feel - Yoshi's Woolly World). So seeing spin-offs thrown together to pad out the rest of the systems life cycle isn't that shocking.
To be honest, it matches the 2005-2006 GameCube years to be fair, with many localizations & spin-off games releasing with even quality most of the time. But the GameCube games of that era had higher quality games though (Mario Strikers & Baseball were MUCH better the Ultra Smash for example).
I think that Nintendo just poorly manage's their IP and its coming to a head this generation. Paper Mario, Metroid, Star Fox...IP's that either were long dormant or otherwise experimented with in recent years coming back in mixed ways (Star Fox Zero being divisive among critics & fans), outright disliked without not much released on the game (Color Splash due to its similarities to Sticker Star) and loathed from the outset despite being a perfectly fine/okay game (Federation Force).
Maybe Nintendo needs to have more quality control people behind these projects or make games they know people will enjoy, as if they made a traditional Paper Mario or Metroid, people would have likely enjoyed them a lot. But the creative teams behind these projects want to make the games THEY want to make and it leads to fun games being produced.....just not the games the hardcore fanbase wanted.
If the NX really has all the A-Teams working on projects and/or the implication that many studios like Next Level & Retro moved Wii U projects to the NX is true, then we are in for a treat. Otherwise, its best to have an open mind for future Nintendo projects going forward. As I can see more experimentation with IP happening in the future franchises like what happened with Paper Mario & Metroid.