The Ranged Fort ST chain is in the 90 to 135 dps range depending on build, but you will lack the -resistance multiplier that most corruptors would get. AoE is is similarly mid-range if you add the Patron AoE. By comparison a Melee Fort is 160 to 220 depending on build, and a NW is 180 to 240 Depending on build.
I am thinking of turning my long since gutted Night Widow into a mez heavy Fortunata with Mu Mastery. Mu gets the AoE Immobilze and some nice AoE in Ball Lightning. I have a great build, at least recharge and survival wise. My main question is how much damage will I really be pumping out? I will have a full ranged attack chain with Psy and Nrg damage. I know I won't be pumping out Scrapper/Brute/Blaster damage but will it be at least Corruptor or Dominator level?