Holy priests have changed quite a bit. Most healers have a somewhat clearly defined niche :
Shamans make great utility and raid healers, druids are the HOT guys with great raid healing, paladins the tank healers and so on.
Holy Priests seem a bit over the place. Are they supposed to be excellent in most areas ?
Are they meant to be a jack of all trades ?
I can see that at some point in Beta, Priests had the highest hitting single target spam heal with 500% but this has since been toned down.