? for experienced tankers....

[IndigoHawk]

Bouncing to different targets makes things harder for a GLD tank. Stay on the GLD's target. A GLD shouldn't lose single target aggro, but it's better to lose a single enemy than the entire group. If you're a DPS and you take aggro and start taking too much damage, stop attacking. Let the GLD regain control. (If the GLD keeps losing single target aggro, they may need to check that their rotation is focused on high single target threat with flash thrown in to maintain group aggro.)

If a DPS switches targets, the DPS may take aggro from an enemy that the GLD is not focusing on. That's difficult for the GLD. GLD keep medium aggro on a group of enemies (enough to keep things off the healer and to handle an occasional DPS AoE) and high aggro on one target. If there is high aggro on multiple targets, the GLD may completely lose control of the situation.

(I guess since we have daily posting limits we just edit our posts ...)

SomeFatGalka describes a good rotation that solves GLD group aggro starting at level 26 with Rage of Halone. That rotation lets the GLD apply single target threat on 2 out of 3 hits. Note he doesn't apply the rotation to the same enemy. Distributing the rotation across enemies lets the GLD keep up group aggro without spamming Flash.

So, if you're leveling with a GLD friend, you may eventually be able to use more AoEs and not be as careful targeting the GLD's target. Starting out, though, keep it simple. Go easy on the AoEs, attack the GLD's main target (which they usually indicate with their opening shield lob), ease off if you're taking aggro, and follow their lead defeating enemies from weakest to strongest.