Updated in bold. Many people tried to defend the Wii U in this thread, by mentioning all the 3rd party ports for the Wii U. But at this point I think it's safe to say that Switch is getting just as much 3rd party support if not more. 

Switch gets the following games within ten months of launch. 

A massive open world Zelda game. 

A Mario Kart Game

An Online Third Person Shooter

A huge ambitious Mario game in the vien of Galaxy/Sunshine

A successful crossover game with Ubisoft.

A good fighting game (Pokken DX Meta is at 80 now).

A portable version of Minecraft.

A portable version of Skyrim.

A portable version of Doom.

A sequel to an RPG that American fans begged Nintendo to release over here.

Portable versions of many Indie games. 

Meanwhile what did the Wii U have at this point? New Super Mario Bros U, which many fans thought was paint by numbers, and a port of a MH game that was already on two other systems, and Pikmin 3.

It's like Nintendo is hitting all the right notes with their software library for the Switch right out of the gate. Most of these games have huge potential to move units. 

Yeah, and it shows from the differences of when I got each console. I got my Wii U in June 2015, over 2 and a half years after its release. However, I got the Switch in June 2017, only 3 months after release.

wii u did have stuff like CoD, darksiders 2 and arkham origins, need for speed most wanted

Yeah I got my Wii U when Pikmin 3 launched. I grumbled about it a lot too. With Switch I got it in May and was excited. 

Actually Wii U had a good launch window line up, people gave it a bad rap and it stuck hard, hard enough that it killed it

No, it had a terrible launch lineup, because it was missing the only thing that matters: Big Nintendo games. It's the same reason why the 3DS had a poor launch, although the Wii U could at least mask its poor launch with a holiday season.

First 6 months:

WiiU:
- Nintendo Land (77% on metacritic)
- ZombiU (77%)
- New Super Mario Bros. U (84%)
- LEGO City Undercover (80%)
- Monster Hunter 3 Ultimate (82%)

NS:
- The Legend of Zelda: Breath of the Wild (97%)
- Mario Kart 8 Deluxe (92%)
- ARMS (77%)
- Splatoon 2 (83%)
- Mario + Rabbids: Kingdom Battle (85%)

Yeah I think WiiU has a pretty solid launch. Actually, looking back, WiiU and Vita had the best launch line-ups but ended up failing the most spectacularly.

No mention of Arms and Pokken (which is very important. It's a pokemon spin-off on a handheld!).

I agree. I was happy with my WiiU for quite a while, actually. Eventually, even publications that hated Wii U began publishing "Why you need a WiiU" articles. It had okay third party support at first but then Nintendo had to carry it on their own.

I have a Switch but some of those bigger games are on the console solely because they're WiiU ports/sequels using original assets. Switch is great but don't knock the U!