The irony is PLD arguably has the worst self-sustain of all the tanks. It is true Clemency is the Duty Finder Freshmaker, able to pull together even worst of parties.
However, it's hard to fathom how many parties are carried by WAR's huge self-healing, or TBN's huge 25% absorption + Abyssal Drain's massive sustain on pulls. I think all the tanks carry parties to some degree, though the difference is PLD is the only one that has to disrupt their DPS to do so, and block doesn't quite make up for that.This is false information. Nascent Flash applies to 3 GCDs. Keep in mind, it only has to be active for the start of the attack to snapshot its effect.
All in all the healing is excellent when doing trash pulls, within IR, or when using Inner Chaos. It's not Clemency, but it's enough that if the healer is the first to die I can get people through any dungeon boss and some of the trials or raids as long as people don't mess up too much.