The fight does favor Holy, quite a bit actually, but that wasn't my point. The issue is that her aura's damage increases as the fight progresses, but also that there are specific things you don't want weakened soul already on people for such as the link, or the shadows. The issue here is that because people are always taking damage PW:S is not going to be your all around best spell. It is your best filler between big casts, but not your best spell overall. Best spells on that fight are PoH, PoM and Binding Heal for Disc and PW:S takes a secondary role being used to mitigate the non-constant damage sources and tanks.
The point is this: When a fight favors a particular style of play, that's how you should play. It is not Lich King where you can stack to 37-40k mana with 3k SP and have infinite mana while being GCD locked with PW:S and doing a great job. It's a fight with constant light damage mixed in with some spikes and positioning issues. It favors AOE heals. As Disc your only choice is PoH.
If he was doing better, using BH instead of FH, using PoH more and PW:S a bit less and the Holy Paladin wasn't trying to FoL spam and switch to HL they could have had the poorly-played Resto Shaman go Elemental, or Enhance without any issue. However, because neither he, or the Paladin was playing spectacularly, the mediocre Shaman was needed. Instead of patting him on the back and saying he did fine, why not give a proper critique? He could have done much better with his gear. If it's too hard to swallow that's fine, but it's a fight where Disc can put out 8-9k HPS and people are trying to convince him that 4.8k is doing fine.
If you really want a top log, then here you go:
http://www.worldoflogs.com/reports/s...?s=8466&e=8682
PW:S is cast much less.
Penance cast much more.
Renew not cast except on tanks.
PoH cast much more.
PoH glyph is use.
Desperate Prayer at 0% overheal.
Difference? 3.5k HPS. Yes, the healer setup is different, but any top log will be 2 healing anyway with a Disc Priest. There's not enough damage for top players to need to 3 heal her.