It depends on how they do it, if they stun you at 75% health or another player is on you as well, generally means you are dead. It can be rewarding but I usually think if that happens they made a mistake in using it.
I believe this should be the way it should be but you can start getting into the trouble of making rules on how it is determined you are a healer or otherwise. A good example would a person playing a majority of their games as a healer and then switching to a dps to push themselves higher while still being considered a healer based on games played. Maybe they can require you to lock your role in ranked feast and if you want to change your rating resets? They already sort of have the same system in place in regards to changing Grand Company(15 days can't change again) and having separate pvp ranks for them as well.
