The game is supposed to be a card game, with strategy. There is no!
To understand that, you just have to look at the ranking. The best players are not the ones who win more than they lose. The best players are the ones who play thousands games in a month.
The game has very good things, but all is destroyed by some unbalanced cards, updated months after months, but as one said in another comment, when they fix some unbalanced cards, some others appear at the same time.
I can also tell about the toss, which is everything but random. You can play 10 games in a raw without having the toss for you, knowing wining the toss is a big advantage.
So, save your time, don't play this game.
Even if you have a lot of time, save your mental health playing another game.
I played many card games. Played Yu-Gi-Oh when I was a kid, then because of my love for Warcraft, I played Hearthstone for years. Then because of my love for the Witcher, I started to play Gwent. At first I thought that how would I get those cards to make a decent deck but thanks to the generosity of Gwent, I made my first decent deck scond week. I realized I worked like a slave when I was playing Hearthstone and loved Gwent even more. At those times Rank 21 was the best rank and I was 20 (never hit 21, sadly) with my own deck. It amazed me that I didn't need to netdeck streamers to win.
After patches and the other stuff Homecoming came. At first I didn't like it, I wanted my old Gwent back. Like everyone else. But when I tried to like Homecoming, I realized that it is not different than the beta version at all. OK there are many changes, but after this last mulligan update it literally started to feel like old Gwent, with better graphics and rewards.
TL;DR: Gwent is the most generous card game on the market (literally got full collection and most of the premium cards without spending a penny), and you can play with your own deck instead of netdecking and still can win.
Until I found Gwent, I was exclusively a single-player gamer.
Gwent is a fun game that you can play both casually and competitively, and is very free-to-play friendly.
I really like the game, it's constantly improving, and they show very clearly that they listen to the consumers.
It's very cheap to buy the cards if you need them, but you could easily get by without spending a time.
A hell of a good time.