While leveling up alt jobs using leveling dungeons I have noticed that a fair percentage of the low level tanks that end up in the story dungeons have no idea how, or desire to, tank.

If new to MMOs they look at the classes in character creation and want to play a melee character that wields a sword or a big axe. I don't think they actually understand that they are not just DPS in heavy armor.

They happily play the gladiator or maurader class solo and it feels like a melee DPS to them. They get to the point in the main story where they need to do a group dungeon and suddenly people are harping on them about keeping agro, spamming flash, etc...

I'm at the point now where if every pull is an adventure and friendly advise about agro tools is gong unheeded I just quit the instance. Better that than stick around for the drama.

In the lower content I have completed a few dungeons with me resorting to healer tanking but this really isn't teaching the tank anything and is probably hurting more than helping

Do you think there should be a warning for new players choosing the tank class stating that it is an advanced role and if they don't have MMO experience perhaps they should start out with a different class?
Most MMOs allow you to DPS as a tank class but in FF14 this isn't even an option.