Burning thought
Restricted
Thats not true, you see the mage who gets the most aggro can have a shield placed on him so that he can stand invulerable while all the main enemies (or a boss) attacks. I play on hard and it works fine, I cant see how it would make a diffrence if I was playing on any other difficulty tbh. At the moment I lay down all my AOE, and thats a lot of AOE which kills off most large groups of opponents, then I simply trade off paralysis, stuns and slows on all the yellow or orange mobs, if theres those who are not slowed or stunned like many Orange mobs are then I simply shield the guy who gets attacked first. Continue to nuke.
What I find useful is having one mage, preferably main character as an Arcane warrior, have a second set of gear, sword armour etc waiting for him so that when enemies come into range after youve spent all your mana, you can activate all your free sustained abilities and not be bothered by the annoying upkeep since your mana is already gone. Then ofc as an arcane warrior you can survive a good deal with Wynne healing even without a shield.
Also on a note on the last boss:
Spoiler:
Did anyone find him quite easy, I beat him on normal difficulty with a fairly even group, me as a battle mage, morrigan as a healer/second mage dps and I had Alistair (Tank) and Ogden (melee dps) the dwarf and we beat him quite handily. Called in steel Golems as our only backup, he was dead before we needed more. He was an awsome boss so no disapointment, he was fun to fight but just not that hard