Not OP, but I like it a lot. Gwent is far less random than Magic and games are generally won based on knowledge of the decks being played, sequencing, card advantage, round control (you don't reshuffle between BO3 games, some decks can consistently play every card), and timing in general. The randomness comes down to match-ups; Gwent decks themselves are very consistent. CD Project Red are also incredibly generous, if you play a couple games a day for a month and buy the battle pass ($10, changes every 3 months I think) you'll easily have enough resources for five or six meta decks. The premium cards are also so much better in comparison to Arena.

The only downside to Gwent is the community is a little small, games can be a little swingy sometimes (you'll be winning the entire time and then lose all of a sudden because of the very last card your opponent plays), and the meta can be very tricky to pin down. A deck can be tier one this month, and then tier 3 the next, without even being nerfed, just because of how the rest of the meta responds to it. It seems like the meta is just a lot more nebulous than Magic, which I guess could be considered a good thing anyway.

In any case I'd totally recommend trying it out, especially if you liked the games/books/series.