8/10 closer to 8.5 actually. As other posters have said there were a few plots that weren't sufficiently carried over from WoR, Adolin's murder of Sadeas being the main one. I was expecting consequences but it seems Adolin got away without any.
Another thing that no one has mentioned so far is that none of the radiants make no attempt to include Malata. There's one conversation between her and Shallan and then nothing between the rest. I can understand Brandon leaving her somewhat offscreen to keep her motives mysterious, but she wasn't even present in the final battle!
Contrary to some other users, I really enjoyed Shallan's arc. Having multiple personalities seemed like the natural way for a Lightweaver to struggle with their powers.
Overall I think this book suffered slightly from a large widening of scale and some of the character moments (Jasnah coming back) and continuity (Adolin's murder investigation) were weakened as a result. Having said that, I loved the last half of the book (parts 3,4 & 5).
Also not a fan of an how the love triangle was resolved (not necessarily the outcome).