Great atmosphere, top notch voice acting and hand-drawn graphics. Thronebreaker is ~30 hour long campaign with many quests and plot twists around the way. It really captures the essence of the witcher world and the card recruit/RPG aspect based on your decisions is fantastic. You also gain a very substantial amount of rewards in multiplayer Gwent game by unlocking trophies and achievements. The only problem with the game are the bugs. Some battles lag out hard because of the poorly written AI, and there's some performance issues here and there.
Gwent has hands down the best artwork in any card games right now, and with a unique twist in gameplay. It recently suffered a large set of changes due to the Homecomming update but despite some minor imbalances here and there the game is quite fun and polished now. It's also incredibely generous to players in terms of rewards and progression so grinding for cards is very fast and very rewarding as well.