FWIW - My review is now up at trekmovie.com.
Good stuff - this bit:
Gone is her (albeit flawed) logic seen in Star Trek VI, replaced by stereotypical childhood issues
is pretty much the heart of the problems with the book - we *know* the Federation-Klingon alliance works out because we've seen it but the characters don't or shouldn't - and a character who decides via (faulty) logic that this is the best cause of action and is still convinced of that would be more interesting (and from our vantage point, tragic) than the motivation we got. I think the back-story we get here makes the character less rather than more interesting.