So, with all these people agreeing it does have it's uses, but is of very limited use, and situational, how about you also add +2 WIS to this enhancement?
Look at the barbarian one. Increased chance of glancing blows triggering special effects, increased glancing damage AND +2 STR. I would argue the first 2 parts of that particular enhancement is more than of limited use, and very much better than the cleric one.
And don't tell me it's different for casters. FvS gain +2 CHA and, depending on their path (I'll focus on the healer), things such as no SP cost on their CLW. That pretty much means they can top off people all they want between battles without using any resources. That AND a stat bump far trumphs the capstone of the cleric.
I still love my cleric, but this enhancement is just a kick in the face.