Coming with Medium Cloak and doing a Blast Pulse and Heavy Torpedoes followed by one or two shots is enough burst to take most of Tactical and Artillery Cruisers's HP before they can even react and pop their shield (if they even still have some energy...). Following that, just use Afterburner and you're mostly safe.
This very simple combo is very hard to counter in low ranks while being extremely effective.
Even Dreadnoughts and Destroyers can take heavy damage from that. Granted if a Destroyer react in time, the Corvette will probably be obliterated by FLAC canons.
But still, as a Corvette player, I have to admit that I'm able to get an enormous amount of easy kills currently at rank 9.
Maybe it's less effective at higher rank, but it can remain very frustrating for new players trying ships like Tactical and Artillery, making them think those are super weak.
Although, this is a very difficult thing to balance since lowering the amount of damage a Corvette can do will end up making them underpowered by a lot at higher level. Maybe reducing the cloack duration might force Corvette into spending most of their energy in Speed to get closer.