Corvettes use VeryLight armor and COMPOSITE weapons.  Titans use Titan armor and TITAN weapons.

Here's TITAN DamagePercentBonuses:

DamagePercentBonus:TITAN:CapitalShip 0.75
DamagePercentBonus:TITAN:VeryLight 1.0
DamagePercentBonus:TITAN:Light 1.0
DamagePercentBonus:TITAN:Medium 1.0
DamagePercentBonus:TITAN:Heavy 1.0
DamagePercentBonus:TITAN:VeryHeavy 1.0
DamagePercentBonus:TITAN:Module 1.0
DamagePercentBonus:TITAN:Pirate 0.75
DamagePercentBonus:TITAN:Titan 1.0

As you can see they're effective against everything.

IIRC, the lasers and missiles on corvettes are, as said earlier, composite weapon types....the autocannons I believe are anti-light weapon types...

An interesting idea (if it isn't already implemented) would be to make the anti-light autocannons also able to target SC...

Then we'd have a damn good counter against LRF and bomber spam...

Nothing. Capital ships are next best at 0.95, followed by medium (i belive thats LRM's), at 0.7, everything else is 0.45-0.55.

I presumed everyone could have figured that out themselves but i should have mentioned it, your right.

This also demonstrates why corvettes vs titans is so horribad too, the corvettes, (and heavy cruisers) have a 0.55 multiplier.

Why, it's pretty obvious from their era of avalability and their weakness they are not remotly meant in any way shape or form to be anything other than chow for a titan. Right nowm, even without the damage table effects on corvette weapons the titan vs corvette system is the hardest counter in existance. Titans are set up perfectly to mass murer corvettes with impunity. Altering them so they're only effective vs strikecraft, LRM's and titans just pushes their usefulness down even more. Right now Titans are the only thing they're not efective against, whilst the damage types makes the excellent LRM and bomber killers besides.