Same here, the toughest one for me so far were Sunken Temple and Ogre in Dzemael Darkhold ...
In the ogre fight casters don't have nearly enough time to cast their spells ... bah, I had a situation when one healer refused to cast healing spells, only buffs, becouse he couldn't avoid all the incoming rocks. This is a serious problem for everyone, especially in later fights where there are no red markers for aoe attacks ...