I remember getting really excited when I played the level 10 (or so) gladiator quest at the appropriate level, because pretty much the only way to finish it at my skill level with my gear was to hold the enmity of the guys trying to kill the NPC. I thought "Oh, nice, the class quests actually teach you how to play the class!". Too bad it's one of 3 or 4 class quests where you're required to do pretty much anything but just tank and spank a boss or a group of enemies.

I understand why the game isn't extremely structured to teach you how to play your role. Squareenix doesn't want to do anything to make the game less casual friendly. I suppose if the fights in the job/class quests were designed to mimic actual party content (like with NPC party members, for example), and enemies and NPCs had buffs/debuffs that exaggerated the effects of you playing your role right, that'd be a step in the right direction without scaring casuals away. Some people would still ignore them, I guess, or never make the connection of "Oh, so this is how I should be playing my class..." but it's probably better than nothing.