I will third/fourth the DRK quests, as you don't really see a sense of how the WoL is dealing with everything that's happening during MSQ. The DRK quests directly address those in a pretty nice way, and I'd have to say it is one of the more emotional, impactful storylines - unlike some of the other job quests which have weaker stories in different expansions, I felt the DRK job quests were incredibly solid from 30-70.