I wouldnt say Exaggerating, but it can be done just takes ages to set up and no 1 is gonna let you get it off.
phyfiend 3orbs power infusion trinket. dot them up devouring plague mind flay is insane damage.
but yeh takes a while to set up and you need a good 4-6 secs bein left alone to do it that isnt gonna happen.
but yeh when you factor in LoS and cd's it's not so grear but i wouldnt say the damage is half then other casters