Re: Logen Ninefingers and the rest (spoiler alert)
On Glokta, I don't think anything extra was needed. I like the ambiguity of Logen's end and thought Jezal's was fine.
I was less satisfied with the Dogman.... now I come to think of it I think he just becomes an ambassador, doesn't he?
I don't think unanswered questions are necessarily a bad thing. Not everything has to be spelt out, and open-ended questions means the author can address them later if he decides to (most obviously, a sequel about Logen or Ferro).