Our 10 man group has finally gotten this done. The fight is much more doable without a specific healing setup since the nerfs to Mimiron.
A discipline priest for this fight is extremely useful. Somehow I doubt it would have been easily done without shield spam, power infusion+PoH spam, and lots of penance. This fight more than any other makes me wish that Penance was not getting nerfed (which I still maintain that this is a pvp nerf rather than a pve nerf).
Dealing with the penance nerf will be more doable with new gear and the t9 4 piece bonus (not to mention the divine aegis from shields). However, Discipline priests have no other heal that is as power that can even contend with the power of penance. This nerf encourges Pve priests to use filler spells that will "hopefully" keep everything up until the cooldown is up.
It leaves us as healers at the mercy of cooldowns.
Don't get me wrong, I am sure that we can adapt but after recent mana nerfs and such it is no longer a question of saving penance for spike damage, we have to use it because our other heals are either too underwhelming or too high and mana cost.
I miss having Greater Heal as a viable tank healing option.The truth of the matter is we have no talents similar to Empowered Healing and so simply the only spell that scales is PW:Shield.
What does this mean for healing?
It means there will come a time while you are raiding where you will have to depend on the fact that there is someone else healing with you on the tank who can cover the few second gap where we do not have a powerful heal. Using Greater Heal costs too much mana and costs 5 talent points for disc to have the viable option of even casting it because otherwise the spell cast is too long to be useful.
The same is true of Binding Heal, high mana cost and no real benefit out of it. I did use it for firefighter in 10 man last night when I was the only healer for a few nailbiting moments. Its just like how renew is also a lackluster option, again high mana cost for a spell that doesn't warrant the cost (1200 per tick just doesn't do much).
I wish Blizzard would instead nerf things for PvP only. Nerfing penance isn't a matter that oh we aren't going to use the spell now, it is a matter that we will be less capable of healing a tank. We are less likely to save that person who suddenly drops low because if I know a plasma blast is coming in less than 10 seconds, I'm going to save it for the tank.
Flash heal would be the only real option for healing this person if the already had weakened soul. PoM is going to do anything unless they get hit again, Gheal would take to long and cost too much to just top them off. The thing with flash heal, it isn't as strong as a holy priest's so I may as well leave it to them. Discipline needs more viable options that will not make us go oom with repeated use. That is why people are using penance so often, it is a quick, efficient heal unlike anything else we have in our arsenal. Personally, I have not come across any time where my Divine Aegis was stacked so high due to penance that is lasted longer than a few moments of incoming damage.
The outcry of PvE disc priests is being heard on the forums but I doubt that they will give us anything to suppliment the longer cooldown so that we have a useful option until the cooldown is up.
And frankly, I don't see them nerfing Holy Shock's cooldown which is an instant cast that heals for a good bit, especially with a crit.
It might not be right to compare penance to holy shock since penance is better but as a single target healer I have to say that we should have something or some talent that improves our flash heals or makes greater heal a viable option that will not make a priest (any priest for that matter) oom in a matter of a few casts.