As a free action, its a 9.5. I consider it practically must have for any paladin, and great for many clerics.
But just to start a rant, the FAQ is dead dead wrong on the issue. The book clearly states the feats are standard actions. DOTF pg. 19 under divine feats:
"Since turning or rebuking is a standard action, activating ANY of these feats is also a standard action."
If the FAQ wanted to make an errata change it should have made that clear.
As a standard action, I still think its a good feat, considering the first round is often spent with a charge, using that first standard action (or partial for surprise rounds) to often gain a +3-5 to attack and damage is still well worth it.