I like 3rd classes too. Before the 3rd classes were implemented, there's only 4 classes that can kill in PVP/GVG which are the champion, whitesmith, creator and assassin cross. You can add the 2 mage classes on the list depending on how many GTB cards are on your server or how the server you're playing on handles the GTB card. The rest of the class just can't kill any "hurry potter" player lol. You know those who spam recovery items or uses berries a lot.
Trans server are just boring, you'll see the same stuff over and over again. Creator acid bombing just about anything and everyone, assassin cross 1 hitting everthing wth edp, link and sonic blow, whitemsith spamming cart termination and champion asura, berry or anything to replenish his hp/sp then asura again. Wow, seriously boring. Everthing a lord knight can do, an assassin cross can do better. From killing to emp breaking.
Playing Lord Knights and sniper or any other classes makes you feel useless because you can't kill anything and all paladin can do is just be a meat shield with devotion. Stalkers are just strippers, even if you strip all their equips, you still can't kill them even if you spam bowling bash as long as they know what they're doing. A high priest with assumptio is just too much for a stalker to kill.
As you can see, imbalances are always there in Ragnarok with or without 3rd class. But with 3rd class, it's more fun because every class can actually win. There's more skill to use that adds more strategy to the game like shadow form, white imprisonment, reverbration, gx poisons, death bound, windmill, runes, cursed circle, diamond dust, etc...
Though I would agree that renewal Spiral Pierce is just crazy but I have read on iRO forum that it will be nerf in the future.
Overall I like 3rd jobs but I only played them on private servers with pre-renewal mechanics. I like some renewal changes too except the spiral pierce one.
That said, I prefer servers with 3rd Jobs with pre-renewal spiral pierce like ValhallaRO.