It's very much a romance novel, so you'd be disappointed if you went in expecting epic action stuff. I haven't read all of cosmere, but as for quality, I'd say it's way above Edgedancer & Dawnshard, and probably a bit below the Emperor's Soul.
This actually sounds good, I may have to give it a read. I haven’t been much impressed with the secret projects so far, how would you compare it to the 2 that have come out so far?