A great thing in the Warhammer lore is that the dark elves really are that evil. Everyone is violent if not genocidal, but the dark elves get a category of their own.
Most of it involves slaughtering peaceful high elves. Look, they are lining up for honorable combat; to the siege weapons! A graveyard full of mourners; free ambush chance! A tower of poets and researchers; kill them all! The public quests really felt right: slaughter the people who are just standing there, wait for someone to come check on them, then gank him too. Knock over some pillars while you’re there. I know that most of the game is fighting the other side, but it is about assaulting a keep, fighting back an assault, or at least hitting opponents who were asking for it. Dark elves raid temples because they like kicking nuns in the face.
Just to make sure you know you are in high elf lands, there are unicorns early on. *stab* Take the Butchering trade skill for extra credit.
A quest involves poisoning someone on your side. Showing off his magnificent bastard stripes, your contact then sends you to plant evidence that he did it. Your commander knows that his best poisoner would not be so sloppy as to drop his gloves during an assassination, so you are sent to kill the guy who seemed most likely to frame the guy who framed himself.
Oh, and that graveyard? Right-click to detonate the mourners’ flowers. You gain nothing for it, there is no reward or reason: you are just blowing up their flowers.