I also agree that we dont need new ship classes, but if one were to be created, I would prefer a Raider for all three factions.
NomadWarriorSoul, I DO know about the Arcova's Time Explosives, but the timed explosive ability does not turn the Arcova into a good raider. A good Raider can destroy structures and/or bombard planets to make a profit and destabilize the enemy. Arcova's can't do that, you'd be lucky if you succeeded in destroying 2 structures with your 10 scouts. The damage they do is very impressive (1200), but have you look at the cooldown time for this ability; 900 (15 MINUTES). They also require a lot of micro to make it work, otherwise they could just start targetting different structures, and you would end up with no damage done to the enemy.
And what about the other 2 factions, Advent Seeker have no such ability, and please don't tell me about the Advent Seeker's Martyrdom, 250 points of damage AND you lose the ship, it sucks. Vasary have even less raiding capabilities with their Jikara Navigators.
The only way to raid in this game right now is targeting refinery/trade ships (but you dont need a raider to do that) and upgrading Vasari with the Wreckage Auto-Salvage ability.
Foraven, light frigates are easy to destroy only if you overwhelm them with superior numbers or if you have the right counter (Long Range Frigates). Otherwise, they are fine the way they are right now. At mid games, you HAVE to back your light frigates with support cruisers (hoshiko/guardian/overseer) and in late games switching to heavy cruiser might be a good idea (keeping a small number of light frigates, even in late game, is always a good idea for support).
Back to the mega-cruiser idea, I am not oppose to it, but no one here made any reference to what role it would play except to say that they would be better than heavy cruisers but weaker than capital ships. If you want a ship capable of leveling up and using special abilities: build a Capital Ship, if you want a hard hitting cruiser, build a Heavy Cruiser, thats what they are for! What would be the counter to this mega-cruiser?, right now I dont see the point of this unit whatsoever!!!