I downloaded this once and never played it. We were talking about it the other day and how some folks just avoided playing it in Witcher 3, but I loved it there, and it got me started back on my Witcher 3 play through (130+ hours and counting ... I'm playing on Death March), and I decided to try Gwent in its standalone format.
I didn't realize some of the differences they made to it, like only 2 rows per side instead of 3, but it's a great game and I really enjoy it. Nice to see that despite being F2P, you can actually earn a lot of rewards just by playing, doesn't feel like the kind of thing you're forced to buy tons of stuff for.
Then I learned that Thronebreaker was actually originally planned to be a single-player component of Gwent, which I didn't realize, I thought it was just a sort of card RPG thing. But I guess they put so much in they decided to make it its own standalone product. I've played a bunch of that now as well and it's really been a lot of fun too.