Yeah, the nightmare mode is astonishingly less difficult playing a Warrior Priest !
But still this nightmare mode give me the most satisfaction killing enemies !
In a rpg I always mostly love the quests, humour, nice & funny talks with npc's (and the mindreadings), skills & skillboosts to find on equipment, equipment and last but certainly not least: trading ! Killing is also fun, especially in DKS with my current build, the Warrior Priest, and on nightmare ! Really love it, more than I love to kill lots of enemies in DD ! The story of DD, and some quests too + the music is fantastic in DD, but the combat I like more in DKS for personal reason.
What I hope is that Divinity: Original Sin offer us more different kind of enemies than in DKS ! I hope Spiders, little devils, big rats or butterflies, wasp or bee, funny looking imps see the day/night in D:OS !