Each to it's own. I personally find NB insufferable by now because of the drama on forums. And LF actually grown on me, they give Scarlet Crusade vibe, so I hope they won't be goodie two shoe like the current Draenei, and won't be afraid to get their hands dirty.
As for Highmountain, they fit perfectly with Horde the fact that there are various tribes like Skyhorn or Rivermane adds extra flavor to them as well.