Yes, I am disappointed quite a bit. No Exploration-Based 3D Mario game, No Fire Emblem, No Animal Crossing (a spinoff doesn't count), A Paper Mario game that looks ridiculous, no GameCube Virtual Console titles, lack of third party support.
With all that being said, I do not regret buying a Wii U. I got it for $250 (deluxe model), got Mario Kart 8 and Super Mario 3D World for buy 1 get 1 half off, and I got a digital copy of New Super Mario Bros. U for free with my purchase of Mario Kart 8. The Wii U also let me play official releases of the first two Mother games at a reasonable price. Plus Smash for Wii U is amazing!
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 48 million (was 60 million, then 67 million, then 57 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima