I stopped running mages because the game was just way too easy with them and I only play on nightmare.. I had one fire mage using mainly firewall / firemine with the passive when I crit it resets cooldowns, my character was electric mage using mainly the electric forcfield and the skill in the middle which dmgs + paralyze and the other mage was frost / barrier mage mainly using blizzard / barrier. I paired them up with cassandra as a sword / shield mass taunting guard building warrior.
This was just so easy and I would constantly run areas 1 -4 lvls higher than myself. first just trap all the enemies in the electric force field and keep cassandra taunting from a distance outside of the force field while the other 2 mages cast blizzard + fire mine + fire wall + the other fire spell which just does an AOE explosion. Once the force field goes down cassandra has already taunted at least 1 enemy then as they run toward her with the mages behind I cast the AOE taunt to pull them all on her having the non flanking passive on her. So once again the enemies are all grouped up on her and I just repeat what I did in the force field but with my electric mage casting the single paralyze attack w/ high dmg and the other electric spell that fires like 12 or so shots with the fire staff + add on which gives 2% less resistance to staff type dmg. use fire staff and pair it up with the fire mages dmg its just so easy.
I wish this game was much harder, even on nightmare it is just way to easy. This is the easiest lineup to tear thru the game. Even with random groups it is still too easy, trying to find one which would make the game harder. I could just imagine how easy it would be if we had all the right AI settings like in the previous DA