I think this feature is generally useful if a board is not moderated. It is a good thing to have for people to turn off the voices of potential abusers.
EvC is pretty fairly moderated and even though some people might feel "abused" it really only invites sensitive participants the ability to hide from criticism.
On the other hand, it may make people choose their words more carefully. =)
If a nation expects to be ignorant and free, in a state of civilization, it expects what never was and never will be. --Thomas Jefferson