Bought more games to my Wii-U then I have bought so far for my PS4

Well there's 2 key things to remember here:

1)Developers didn't generally spend as much time on the WiiU ports, and really, why would they considering the basically guaranteed low sales? (Late releases for launch titles, The Mass Effect 3 ordeal, etc.)

2)The WiiU, even though its collective power is closer to PS360 than XBO/PS4, does have a more modern design like the PS4/XBO, where the GPU is the beefed up part, paired with a weaker CPU.

So in order for a 360 port to perform better on WiiU, there'd be a need to alter a lot of the game's code in order to better take advantage of the WiiU's design, which, considering Reason #1 and others, there wasn't a lot of incentive to do so. The Need for Speed game does take advantage of the WiiU's design more, and thus it's better looking.

Not in the slightest. I feel I definitely got more than enough enjoyment out of the system, despite it being axed rather shortly. What mattered to me is that Ninten delivered on the games, and they did... for the most part (Mario Power Tennis and Amiibo Fest...)

Things like MK8 deluxe isn't going to make me rush to the store, specially with a paid online later on.
Same with Splatoon 2, maybe a much fleshed out single player would win me over there.
Just Zelda and Snipperclips to look forward at launch, and Sonic plus Puyopuyo during Spring.

I want to see how they handle their WiiU customers in this transition to a new platform with no BC.
They have data in My Nintendo which is linked to the eShop, you better use that Nintendo.

The results for the poll so far seem to indicate that those who bought the Wii U will most likely buy the Switch, and those that didn't are less likely to buy one anyway. They also seem to indicate that those who didn't buy a Wii U never clicked on this thread ;P

Are we talking about the same thing? I'm not talking about the WiiU vs. the Wii; I'm exclusively talking about the WiiU vs. its competitive peers. Since the WiiU launched at a competitive disadvantage years later, the Switch should brace for the same result.

As Einstein said, "Insanity is doiung the same thing over and expecting different results." 

I will buy a switch, But I won't buy the games that I have again for sure

After the wii,wiiu and 3ds, yeah, i will wait at least 2 years before i get a switch.

And see if they do a new nintendo switch/super ns.

Yes, it is much less powerful than PS4 and X1, but the underlying assumption in your comment was (whether you mean it or not), that market would reject Wii U because the system isn't powerful enough - which is proven false by prevous generations consoles selling despite being less powerful.

Nintendo's problem was to focus on the "the more, the better" group of gamers with a product that failed to deliver.

Switch has a competetive advantage, just like Wii and NES. Also, when PS5 and X2 come out sometime in 2018-2019, Switch has a good headstart. Even if it was copied by the competitors, they'll have hard time to match Switch that should have steady stream of games coming.

Yes, it would be insane to repeat whet NES and Wii did and expect different results.

The market rejected the WiiU, largely due to a lack of third-party support (due to a lack of power). Developers are already saying the same thing about the Switch, and that should concern any Nintendo fan. Mechanically speaking, the Switch has a portability advantage, but the market has shown signs of significant contraction. Coupled with the high price point, relative to its peers, diminishes the value proposition of that advantage.

When the PS5/X2 launch, they'll be imporving upon more powerful home consoles. Switch's only headstart will come in the form of its portability, which may ultimately mean nothing. The Switch really does repeat what the Wii did: and underpowered system that hopes to capitalize on pseudo-novel functionality.