Hehe, sorry I went a bit strong there.
What did you think of the rest of my assessment? Isn't it true that the WiiU's design in general lacked usability testing, and that the majority of the games didn't have the depth and finesse that we see in Switch games?
I'm not here to bash the WiiU I loved it, but it's to understand why the mainstream rejected it. So while I'm going strong from a gamer's point of view, from the mainstream point of view, they are also very strict in how they judge how appealing a console is. So while ZombiU might be a cool immersion experience, from an appeal point of view it may have been tedious for gamers who prefer a more pick up and play experience.
I would agree that Nintendo didn't think through the usability of the gamepad or we'd have gotten more games that used it in clever ways. As much as the waggle tech of the Wiimotes annoyed people, myself included, Nintendo got a lot of mileage out of that ability and yet the gamepad was underutilized.
On the second part I'd have to disagree that the games lack depth compared to Switch games. There's a reason Nintendo has ported over almost all of the WiiU's library and that's because they're good games. DK Tropical Freeze, Pikmin 3, Mariokart 8 Deluxe, Pokken Tournament, Capatain Toad Treasure Tracker, and New Super Mario Bros U Deluxe did not add any significant features compared to their WiiU counterparts, but each of them still outsold their predecessors because they were on much more desirable hardware. The biggest problem with the WiiU's games is how slowly they trickled out. The early droughts, where Nintendo hoped that 3rd party ports (like Arkham City, Mass Effect 3, etc) would tide people over combined with the poor marketing and unlikable hardware killed the system, and once considered a flop it was almost impossible to build that momentum back up.
Let's add in Smash Ultimate in your examples for good measure since it's clearly an upgrade o Smash 4 and I'll be down to concede the question that the U had decent, deep games but still even then they got the deluxe treatment on the Switch which enriched then and made then deeper. And still, Switch took those and added more, with IPs like Pokemon that never made it to a Nintendo home console before (it's a hybrid).
So I guess the Switch not only had deep games, but it also included the deep games from the U and made then even deeper. It's an unstoppable combo.
The U only had it's own deep games and they were too few.
What do you make of the fact that you could at best go to the toilet with the gamepad? Imho that's a pretty huge design flaw.