I think the quests were designed fairly well personally, especially compared to some of the other quests in the game. The more I see these L50 job quests, the more I'm convinced they're designed for a diverse group and that having 8 of any job isn't the way to go.

I helped a couple of Dragoon friends with their quest, the party ended up being 2 PLD, 2 CNJ, 4 DRG. Each Paladin was able to tank one of the enemies with healing support and the Dragoons focused on one at a time to take everything down. Went incredibly smoothly barring a few deaths near the end from that obnoxious move the Dragoon has. In this case the Dragoons just don't have the defense/HP to get through the fight easily.

Same thing with the last Paladin quest. Same party, split the enemies between the Paladins and the Dragoons were able to focus and kill one before taking on the other. Hate was a little weird but the Paladins were able to grab hate back easily in most cases. In this case the Paladins just don't have the damage potential to get through this fight easily.