I never had a problem keeping tanks alive in that dungeon or any others, even with the ones that pulled without protect on... those are the worst. Anyways, I had lvl 130 globe though. So maybe getting a higher lvl weapon will ease things for you. Also don't feel so bad, I am pretty sure it was mostly his fault. He should've checked your gear to see if big pulls was plausible. He also probably didn't use CD's... most tanks I've seen in dungeons are really bad at that.
That or the mobs weren't dying fast enough. This happens too and will drain your MP like crazy. How comfortable of them blaming you when it's a team effort and healers are no gods, they can't keep everyone alive if they don't do their part.
