2.5 stars.
I know I shouldn't go into a book with high expectations, but it happens. I think even if I didn't have high expectations I would have been a bit disappointed.
I'm just not sure what it was missing or what my issue with it was. I liked the idea but it seemed really really familiar. I know that a lot of books are similar but the first half of Six of Crows just screamed Mistborn. Seriously Kaz and Kelsier where way to similar!!! And now this reminds me of The Magicians Guild or Apprentice (I can't remember the title), that just doesn't sit so well with me.
It's a quick read and I'll see what happens in the next book, but if I didn't already own the trilogy, I probably wouldn't go out of my way to pick it up.