Still love it... Not everything is perfect, but some of Nintendo's greatest games released here, such as Mario Kart 8, Super Mario 3D World, Splatoon, Smash 4, Super Mario Maker, and some others. It's only right that Nintendo made Deluxe Version ports of some of these games to the Nintendo Switch, so that they can sell the same great game to a much wider audience. But those games are still just as enjoyable on my Wii U.
Some people dislike the Gamepad, but I really like it as a controller, it always felt comfortable for my hands.
I love the concept of the second display in the controller, it feels like a lot of potential was wasted. But there are some games where it really is useful (and not just Nintendo Land). Even in Mario Kart 8, it gives you some features that you won't get in the Deluxe version on Switch.
It's also a shame that the wireless range is so low, in the tight apartment building with thick concrete walls and crowded with wireless interference it can't even reach another room which is not that far away.
I love the operating system and user experience, the Wii U and 3DS really have soul compared to the Switch.
Not many third-party games, but there are some good ones. The Wii U port of Minecraft (legacy) console edition is probably just as great as on any other platform. Years ago, I spent many hours playing it in the local two-player mode, whenever a minecraft-obsessed friend would visit.
I'm thankful to the homebrew community, possibly the most important homebrew for me was HID2VPad, since I don't have any Wii U Pro controllers or Wii classic controllers, but I could use this software to allow visitors to use Gamecube controllers and USB-connected Nintendo Switch Pro controllers as full size controllers in multiplayer games.
Miiverse... I still remember it. It was.. weird?