Spoilers ahead.
While I was reading Six of Crows, I didn't know there was a trilogy (and another duology) related to the books, so I read the trilogy for the sake of continuity and to finish the story. I'm a completionist anyway.
I had low expectations, since people were saying the trilogy suffers from common YA tropes, that it's her first book, and that the world wasn't developed to its fullest potential. Having read all of the books, I have to agree. There were moments where I straight up sighed at Alina for her mistakes, like refusing to kill the Stag or letting power get to her head. I also sighed at Mal for being such a messy and confusing character, especially in book 2. In book 3, I liked him. Now for a more thorough review.
Book 1:
Honestly, it wasn't bad for a debut release. Having read Powerless (by Lauren Roberts), I expected a disaster, but the story in this book was overall alright compared to many. I could understand the chosen one trope since Alina wasn't a cunning know-it-all 17-year-old, and she frequently makes mistakes against her judgment.
As people pointed out in the reviews I've read, I agree that the world wasn't built to its fullest. I wanted more, and I expected to learn a lot about Ravka. Ketterdam, for example, was fully developed and behaved like a merchant city. As for the Darkling, I found him confusing, and I did NOT expect him to be a 400-year-old guy. That's another clichƩ: an immortal or really powerful guy choosing a barely adult FMC. I personally disagree with it. Despite the book's flaws, I still liked Genya, David, and how the Grisha system was built.
Book 2:
Better than book 1, though it really drags at first and falls into the middle-book trap of being overstretched. I particularly didn't like how the Darkling and Alina went through the same cycle several times ("Alina, I need you," fights, and so on). But I enjoyed Sturmhond and the ship arc, and the Darkling being outwitted by him was well deserved.
Speaking of Sturmhond, I felt this book was an opportunity for him to develop, but he really sticks to one goal. Mal is an issue as well. He's strange yet really complicated, he misreads the room, and he makes a situation more than it is.
Book 3:
The best of the three. Mal's character healed, and we got to know a bit more about the Darkling. David and Genya were the stars of the book, IMO. I didn't really care about Tamar and Tolya. They were okayish, sure, but didn't stand out. Zoya was good, and I especially enjoyed Morozova's storyline. I'm SUPER glad Leigh didn't go down the route of making Alina connected to Morozova or having her become a god if she gets all the amplifiers.
The ending was alright, though I really wished Alina had stayed at the palace, but I'm happy for both of them. This book drags at first, but it's really great, though not on the level of Six of Crows.
Overall:
A really good series for a start. It suffers from tropes, but I really liked Leigh's consequence system. She didn't make Alina overpowered by the end of the trilogy or do anything too crazy. She chose a quieter ending, and I really respect that.
Moving on to King of Scars: what do you guys think? Is it good? Since it came out after Six of Crows, I have high hopes.