The Wii U was awesome and I have nothing but great memories of it. Switch looks like a sad joke compared to it. It built its entire success on re-releasing the same games, and the magic and passion has been totally wiped out after Iwata's passing, with only the pure business logic surviving.
A game like Nintendo Land is the perfect example of what was lost. Splatoon also saw the light of day on Wii U. Same for Breath of the Wild. And Xeno X. Bayonetta 2 was excellent. Hyrule Warriors remains the best game of the series. Project Zero was super cool too etc...
Excellent Virtual Console feature as well, with GBA games being awesome on the Gamepad.
Miiverse, in game manuals...
The console was also capable of receiving third party games without them being vastly inferior to the other consoles.