I think it is worth it if you never owned a Nintendo system before. It is basically a Wii + Wii U. Also you get the entire Wii Shop channel games and Wii U Eshop games. So you also get the legacy titles like Super Mario Bros. However if we are going by Wii U exclusives because you own all those systems I would think not.
It took me 3 years after launch to get wii u, which is really long for someone who only plays on Nintendo systems. It took that long for me to justify buying it. I can only imagine someone who isn't a Nintendo fan look at the system.
Switch on the other hand I knew that would be worth it Day 1.
ok not really but it was definitely worth getting it year one.