The "Corrupt the Al'Drym Woods" quest is AMAZING. The ending was super raw--I actually felt bad about what the Dryad and I did to Hibagon and Falia. The mob shouts are cool, too. It was well worth the time/energy. I heart that.
I also heart the speed at which bugs have been fixed while doing quests recently (thanks @Druu , @Eoghan , and @Jeremy Saunders. I didn't realize questing was so awesome.