I've played for about 7/8 hours on my PS4 and it is the game of dreamers. There is so much to lose yourself in, the lore and storytelling is just incredible, even compared to narratives like The Last of Us, Skyrim or even the previous witcher games. CD Project Red have really outdone themselves this time - still DRM free for PC gamers. You can buy this game on GOG.
For a fantasy fan, it is an amazing game. The voice acting is fantastic, even side quests are intricately structured. Every NPC you talk to is interesting, with their own personality that really shows through on their character design and voice acting. There are loads and loads of dungeons, camps and little side tidbits to explore. Completing one area of the map is a monumental task. Levelling is done very well, with enemies that don't level with you, instead there are areas with different difficulty levels. Being level 5 and running into a level 14 wraith is terrifying and you simply have to run and come back later. Customising Garalt is easier than either of the previous games, loads of armour options and loads of swords. The levelling advancement is up to you, there is no right or wrong way. Want to focus on potions and oils? Then you can. Want to focus more on battle skills like sword damages? You can. Want to be more of a mage and use signs more? You can level those more. But there is a point - the character advancement is limited and you can't use every skill you level, you have to be picky about it.
I truly love this game already and i'll probably soak more hours into it than any other in my possession. I'm not a big fan of the card game, it's pretty slow and boring. I preferred dice myself.