Big ships have big guns, if you hit a small ship with a big weapon, that ship should go 'Poof!' in a faster fashion than the standard frigate. From a balance standpoint is just seems odd, for lack of a better word.
Big guns can't even hit SC...so we already have had a situation since the beginning where "bigger" isn't "better"...
Logically or not, we already have weapons that excel against heavy armor targets but are awful against light armor targets (anti-heavy and anti-very heavy weaponry)...and if we really want to be realistic about this, the biggest ships historically have been countered by either aircraft, submarines, or small, highly maneuverable ships...I feel like corvettes can parallel that role...
I'm not against things like increasing the chance to dodge for corvettes, but really once you crunch the numbers there's virtually no difference between decreasing the chance to hit and decreasing the damage per hit, as it all averages out the same...
They are most definitely salvageable in my mind without making them a one off counter to one type of unit.
Ogrovs only counter one thing, but they are quite useful despite what would seem like an obvious limitation...considering how powerful Titans and capital ships are, a unit that is specifically tailored to deal with these two unit types would still be quite valuable...I wouldn't even say these ships are a "one off" counter either, as they have composite weaponry...the DPS on them may or may not be appropriate, but like HCs they are all purpose units that are weak to only one unit type...
The serious limitation to corvettes is that they are just too vulnerable to the damage done by AoE abilities or ships with multiple firing banks...if you don't deal with this problem in the damage table, you need to deal with it somewhere else....per fleet supply it takes much longer to amass corvettes than most other ship types, which pretty much spells doom for any ship that you're supposed to lose a lot of...