If you're in group content, then why do you have agro at all? Things have to be awful levels of tits up before you actually get agro--chances are your job is keeping the white mage up while rezzing tanks.

If you're solo, then you can tank very well for most mobs. Yesterday I was in the beastlands, grabbing three mobs at once, spreading dots and shadowflaring, and Eos was keeping me topped up the entire time, and killing things swift enough--that's if you don't want to switch over to summoner or arcanist to solo.