I see, quite often, people too low for the quest/zone having much problems playing the content. I believe the #1 issue is, people aren't venturing to other races' zones and staying with content at their level.
What's the best way to address this? People are likely getting discouraged and possibly leaving the game. Whenever I can, I usually tell people to hit up Darkshore or Loch Modan for a few levels. But you always wonder if they ever actually follow this excellent advice...