I'm not sure i would want to run around in pvp with 5 pieces of armor not having impenetrableEspecially in medium armor which means i couldn't just spam hardened ward endlessly and rely on the shield protecting me from crits.
1- It worked every time for me, so I guess they fixed it.Pretty old, I've seen that before. I don't know if they have fixed it, but the health gain only procs, after activating it 3 or 4 times. I don't think this is anywhere near immortal. Templar can heal far more than that and might be unable to attack then, but it goes quicker and heals more. With this one, you can't really attack so good
But I agree, that it might be pretty strong in the hands of a skilled player.