Still a bunch of side quests to go till Blood and Wine is cleared thoroughly, and of course different choices in the story line yet to experience for which I'm planning to make another run soon.
Spoilers below obviously.
With that experience, I'd say this is the crown jewel of The Witcher and it gushes with the love CDPR put into making this expansion.
Side quests are so well done and probably the best side of the expansion. Even the simplest ideas in all of the side quests in B&W are just made so intriguing and can't count the times I laughed out loud with the hilarious moments which there were so many. It's packed with references to the whole history of Geralt, and I love it.
The moment with Aerondight *sigh.*..
Atmosphere for me personally, in it's own way and differing from others draws closest to the atmosphere of the first game in quality. The music is incredible, Beuclair is alive and the whole Toussaint is one of the most beautiful places I've seen in a video game. Absolutely love the atmosphere.
Main story holds so many interesting characters - Anarietta, Regis and Syanna being what made the story for me - and every scene, even the dialogues were very tense, the first half of the story building the plot around the mystery was one of the best bits. I think the narrative side of B&W and way it was delivered is the best yet in The Witcher. Dettlaff is the one that left me slightly unimpressed, for me he felt maybe a bit mindless and one dimensional ''overwhelming'' danger, ( not so overwhelming ), but I think the plot saved itself in the end. It was original and interesting.
Gameplay wise, I liked the new elements and especially some of the ''new'' monsters.
Speaking of monsters, difficulty was a lackluster, which probably wasn't that much about the difficulty of monsters but the overpowered Geralt itself. At this point, I'm not sure how you could make the game difficult without doing it yourself by just restricting some of the ways to build your character.
I didn't die once in the whole expansion, on Death March.
Overall, satisfying ending to Geralt in one of the best regions I've ever experienced in an open world RPG.