I have one, but I havent used it in months.
I'm more of a PC gamer, since I have much more interest in indie games instead of AAA stuff (which usually just bores me), and 99% of indie games do not reach consoles.
I have Zelda and Mario Kart for the Switch. Zelda.... I frankly didnt like much. The world is 99% empty. Someone I know referred to it as a "walking simulator", which to me is true. I, personally, have been calling it "Zelda: Ubisoft Edition" since it's YET ANOTHER bloody open world game. With the same dirt-slow pacing and many of the same mechanics. I gave it a number of hours, and lost interest.
To be fair though, while I loved the early Zelda games, I've hated Ocarina and every one after it, so... not surprising. But even if that wasnt the case, I'd still hate the Ubisoft Formula and any game that uses it.
Mario Kart is.... eh. I mean it's okay I guess. But I dont know anyone that is into it, so it never gets used.
I also do have Binding of Isaac for Switch, but it's distinctly inferior to the PC version (it's more buggy and is outright missing content, and there are no mods) so I only play that when I'm away from the house, which is also the only reason I bought it. Otherwise, I just stick with the PC version. Same with any other indie title that might be on there... I probably already have the PC one. Or the very few AAA games I do care about, for that matter (like Doom).
I have an interest in Splatoon 2, but... I hate dealing with other players in ANY game (and AI isnt advanced enough to substitute for them) so I'm reluctant to buy it.
I'll might buy the new Mario eventually. I've never been a big fan of the 3D Mario games though, to be honest. The only 3D platformers I've ever liked are those by Rare. Prefer 2D.
What I really wish was on there though was Mario Maker. I'd use the blasted thing frequently if that was the case. But nope, have to use the Wii U for that. I know Nintendo well enough at this point to know that despite that game's success, they wont port it. It'd make way too much sense.