I think I've played Sonic Mania the most. The only game I sort of regret buying was NamcoMuseum. I think the games on it are great, but it was a little pricey and Pac-Man Vs. was not what I thought it was. I don't hate it, just regret spending the money I did.
I mostly play BOTW and spend most of my time running about , I have not bothered with the divine beast things or most of the missions. I also play Minecraft. I regret buying Mariokart. Got Splatoon2 2 weeks ago and its still in the wrapper and that game was the main reason i bought the Switch. Hmm disenchanted.