Personally, I would consider the Switch to be a great success, not so much for how well the system itself has been selling, but for just how much greater it has done in the software department.
At the rate that their games are selling and if they continue to show fine leggage, the Switch is going to be the home of a lot of "Best Selling ______ game in the series/of all time"
- 3D Mario
- Zelda
- Splatoon
- Mario Tennis
- Xenoblade... and the Xeno series as a whole.
- Kirby
And potentially Smash Bros, Bayonetta, Pikmin, and Metroid Prime.
And that's before going into all the 3rd party titles, both Western and Japanese that have been selling well.
The Switch version of FIFA 18 is on its way to being the best selling FIFA game on a Nintendo system.
Skyrim has been a success.
The overwhelming success of Octopath Traveler led Square Enix to deciding to have that entire team devoted to making Switch titles.
Super Bomberman R was one of the most, if not THE best selling Bomberman game. And Capcom recently announced they're making a Monster Hunter game from scratch for the Switch. Plus there's Mega Man 11.
And then there's indies.
There's no shortage of software, and it would seem a lot of it is selling.
Hardware Comparison Threads:
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PlayStation/Xbox/Switch: 2022 Edition
PlayStation/Xbox/Switch Hardware Battle: 2021 Edition!
PlayStation 4/Xbox One/Nintendo Switch: 2019 vs. 2020
PlayStation 4/Xbox One/Nintendo Switch: 2018 vs. 2019
PlayStation 4/Xbox One/Nintendo Switch: 2017 vs. 2018
PlayStation 4: 2015 vs. 2016 vs. 2017