Ripple's right, fighters need to pick their targets. Here's the start a handy cheat sheet:
-- Any scout under Raid level.
-- Skirmish and smaller Vree (large stacks can just kill individual ships outright)
-- Many old EA (Nova, Sagg, Tethys)
-- Centauri if fighterless (rare)
-- Dilgar (only 4 anti-fighter dice in the whole fleet listing -- all 2" range!)
-- Drakh Raiders (yes! Drakh have an almost impossible time killing you away from the carriers and CA, so go crit-fishin' baby. There's no reason to stand in front of the Light Raider's beam. Ever!)
-- Shadows (Now that fighters fire first, this is the way you kill those ships that are almost dead before they regenerate all the way back to health. And those vile shadow fighters need to die, as well.)
-- Drazi (what non-boresight guns? On the Guardhawk, king of loser ships?!)
-- ISA ... if you can kill the CQ5 Nials somehow, someway, they are Very vulnerable. Big if!
Things you don't pick on:
-- the Z'Takk, Xill, and Xaak
-- almost any Minbari above of the Torotha, although you'll have to do something about all those dang Nials eventually
-- any Narn that could conceivably buy E-Mines or the G'Karith
-- new Vorlons .... the pulse, and the A-F beam of the Vorlon fighter death squad. Their fighters don't need to dogfight you to kill you.
-- any Brakiri that might have the Takata.
-- Drakh Carriers. They just don't care about you.
-- Abbai. Enemy fighters give the pathetic Kotha something to actually do.
Lots of good uses out there.