JP, I killed you last time with my singularity cannon, so no, you can pretty much even kill Ceptors.
I do know you tried to get out, so it wasnt just a lucky strike.
The magic words are overdrive, heatsinks, speed modifiers, or even aiming boost modules.
And the ship of choice is the Deagle.
Of course some missiles help too.
Its now a way more risky playstyle, and it helps to be skilled in ceptorplay for the overaim at rotational warfare. Also, one ECM and you are basicly useless, especially if it hits your overdrive. Which is why the tanky Deagle is ideal.
So yeah, it is very viable as long as you dont get primaried by a group, even then, you might even bring down the main engineer or guard in the assault with a suicide run, you might even survive it, so its the CO of the fighters. Tested against a Nova teamed pub in realistic, turning the game with one (important) frig kill, while they sieged our Beacons. Next game I was consta-primaried and had to switch to another ship making no score at all. But it does work.
Also, the first T5 Frigate I ever saw was on the scope of my Singularity Cannon, and the nom-nom-nom of my balls. It basicly is a weapon with a constant spread, but you can still use it against anything in a 1v1, as long as you are tanky. I think most fighters however are not suited for this cannon to be that effective, and it stays a frigate killing weapon for them.
Also, it fairly happens now to be a an assist-weapon, which does the main damage, but does not score the last hit all-too-often, especially with emergency forcefields and similar in the enemy ship.