Yeah this, at level 70 I'd probably say drk/war are better in dungeons on average than PLD by a decent margin, mostly due to higher CD uptime, and their lifedrain skills have low cost and help kill the packs faster, not to mention DRK is constantly shielding itself with blackest night too. PLD has maybe 2 hallowed's it can use in a dungeon, but bulwark and sentinel having such long CD's, and shelltron only blocking 1 of the many incoming attacks, and im not sure by how much the passive blocking stacks up against the active mitigation of the other 2.