I am also frustrated by being hit when clearly out of a red zone, told the target is too far away when it isn't, and not being able to switch off cleric stance without knowing the super secret, special time between moves when it will actually respond.

This is me trying to play good:

- Everyone's healed up, I'll switch to cleric stance and pop an aero (dot) on the boss.
- The tank needs a heal now, the cleric stance button looks ready on my hotbar so I press it and start a heal.
- The heal cast bar is half way up - wait a second! Cleric stance still on!!! >:[ ...ok, cancel cast, switch off Cleric Stance and heal tank.
- Uh oh, I'm in an enemy AOE (red) zone. Cast is neeeearly there... and heal-cast-run made it
- Healing tank and... BOOM, what hit me!?!?!?!?!!! Oh well, stupid lag, better heal myself and not wait around next time...stupid lag. Wait why is that heal on the tank so pathetic? CLERIC STANCE >:[ ] mashing cleric stance like mad so it turns off then straight back on again. Weeeeeee... start casting cure 2 on tank in desperation and too late he's dead.
- "/p Sorry guys, there was a small fire in my house", or similar...

In beta there was a whopping thread about the AOE lag issue started by complexx. Square-Enix said they fixed it?