Jin'rokh the Breaker(25m): Because of the + to healing done by standing in puddles, this actually makes healing rain and to some extent chain heal very good on this fight, I know it is regarded as the only fight we're decent at, but it also seems like the other healers can do better than us even in this ideal stacking fight. What's good about the fight is that it doesn't reveal any glaring issues about shamans, we have the necessary tools to deal with this kind of damage.
Horridon(25m): Because of the way the damage occurs, very random and not exactly a massive amount of damage to the entire raid, I would say that we have decent spells to deal with this kind of damage as well, good cds, and overall this fight isn't quite so horrible as it might first seem for rshammy. Although I have to emphasize again that it seems like other classes have much better ways of dealing with that kind of random raid damage on 6 or so people at at time.
Council(25m): This is where things go very wrong, healing rain can be placed on the melee for some healing, but typically the raid is moving and dodging quicksand along with a bunch of other mechanics its difficult to get that to work on anyone. So during damage phases where there isn't a significant amount of damage going out, we are left with GHW, or HS and riptide, chain heal flat out does not work here, even in a 25. Big point here is we do not have a filler spell to use during the parts without damage from things like sandstorm etc. All other healing classes have filler spells to keep the raid going.
Tortos(25m): If we stagger our cds with each quake that he does, we do have enough cds to spread around to do a decent amount of healing, and in general this fight is pretty bad for any healer classes that don't have many instant cast spells, so during non-quake phases shamans are pretty lackluster, during the quakes however, if perfectly timed then we can claw our way back with perfect cd use. So again, feel like we are missing a good instant cast aoe healing spell (not exactly a filler spell).
Megaera(25m&10m): This fight was significantly worse in 10 than in 25. When I did this in a 10m group, I barely did more healing than the tank, during the grouped up rampage phases, a majority of the damage was just absorbed, leaving mastery completely useless. In addition it just didn't seem like I could do anywhere near the burst healing of a hpally, even though shamans are supposed to be reactive burst healers, overall not sure what can be done to improve 10m Megaera for shamans other than to just not have a hpally or disc priest, or ask if they wouldn't mind saving mana and letting the shaman heal during rampages, because I'm 100% we can. In 25m the problem was less apparent as there was enough raid damage to make spells like Ascendance and HTT worthwhile to cast.
Ji-Kun(25m): IF you are lucky enough, ask your RL for nests #3,4,8 or 9, these will line up perfectly with shaman cds, and nests are really fun to heal anyway. This fight just felt like the mechanics were fun enough, and I was in charge of and soley responsible for keeping my group alive that I didn't mind at all the spread out nature of this fight. That being said, I still felt like shamans were lacking a filler spell to cast when we have no cds available; chain heal comes to mind on this fight.
Durumu(10m): This fight really emphasizes the clutch nature of shaman healers. During the maze phase of this fight, Ive found SLT along with ascendance has saved 3 or 4 people when they took a misstep into an eyesore, however if everything goes perfectly there really isn't too much to heal. This fight matches up very well with 3min cds, so overall not a terrible experience. However again it just seemed like during the times when I didn't have a cd available it was just HST ticking away, chain heal comes to mind that it could really be a good filler spell if only it was not the worst spell in the game. Light of dawn is something that I am truly envious of.
Primordius(10m): I've only had 2 attempts on this boss, but its pretty much as bad if not worse than Megaera, lots of movement, no stacks and just trying to force myself to use chain heal to absolutely no effect, it might jump to 1 or 2 other people but that is about it. On the other hand Light of Dawn was just hitting everybody and stacking IH on the whole raid. I just don't get why CH is so restrictive and yet spells like light of dawn exist in the same frame. I'm not at all asking for nerfs to that, but please just buff CH to at least be on par with a spell like that!