I think my main issue with this book was the lack of what seemed like real stakes. The first two were life-or-death situations, and this one... just wasn't. The humor was fantastic, and the personal relationships was *mostly* great, but there just didn't really seem to be any sort of concern for the characters. Also, I often didn't understand Sabetha's actions... they seemed forced. 
 All of that said, it was still a decently enjoyable, quick read and I did very much like the flashbacks (especially considering seeing two characters I missed from earlier in the series).