I agree that it is alright to have a weakness, but not if that weakness is prevalent throughout an entire raid instance.
A majority of the fights in T15 are spread healing and high mobility fights, and in almost all of those fights, restoration shamans have nothing to use other than riptide and healing stream totem, and honestly healing stream totem is the only one that really counts out of those two when we are considering just healing the raid without the use of cds. HTT helps us catch up a little bit along with a well placed (a very well placed) spirit link totem, and ascendance (would have been nice if T14 had 3 tidal wave procs instead of just 2, weak as that bonus was even with 3).
I heal on my holy priest/disc priest in another more casual raid, and I like the tools that priests have, cascade, lightwell renew, renew, and most of all prayer of mending; on my shaman I just don't see any comparable spells, chain heal is about the closest I can come to as an answer but that spell has been worthless with its range limitation and even with the glyph it just feels clunky with the extra cd added on to it. HST is probably the next spell that is comparable to some degree as it is a smart heal like prayer of mending.
The other healers I feel are in a good/better spot because their bread and butter spells have been looked at or designed in the current expansion, having said that, everything that shamans have that was designed in MoP works well, HTT, ascendance are spectacular, the difference is our new spells are all cd based so we have to stagger them which works, but if there is no cd available then there really isn't much we can do.
Before I go any further, I don't mean to even imply that druids and holy priests were great in 5.1, I know that is entirely untrue, and in some ways druids share the same flaw that shamans now face in 5.2 but for druids that involves stacking and just not having a great big aoe heal.
My friend pointed out that holy priests haven't seen a real buff since 4.1, but I've always felt that holy priests were so diverse that all they ever needed was some number tweaking, shamans on the other hand have a fundamental flaw, spread out healing is just non-existent. I would just like to see the same diversity when it comes to shaman healing and a huge reason why shamans are so bad right now is because chain heal, our only real comparable heal that we have to heal a more spread out raid was nerfed after WoTLK and now for some reason its considered taboo for us to spam that during an encounter even though disc priests spam atonement as a filler heal, and it is a smart heal, and it has 100yrd range, so I can't blame them at all for spamming it, but the question is, if they are allowed to spam a spell like that; why is it that CH is such a taboo spell? (no pun intended).
For CH to work, I think a few comments regarding how to go about that have already been posted, and for the most part this is what I read about it, reduce the cast time by 0.5 secs, increase the range jump to 100yrds without the stupid glyph and no cd penality, and buff its healing output OR increase the number of jumps to 5 (would prefer keeping targets to 4 but buffing its output, that way its more balanced for 10s as well), and reduce the penalty CH incurs when jumping to successive targets.
The other thing I just don't understand is how this got past PTR, how of all the people monitoring what was going on in PTR did no one even come close to seeing this happen when they were designing the raid instance? The fights are amazingly fun, and I do not think that the fights should have a stacking phase and cater to shamans just to please us, I love moving around a lot and doing some tangible healing in addition to that, but we're just so tied down by healing rain that its very very difficult to feel like my heals are doing anything without using healing rain, and I just don't understand how something like this got past PTR.
In regards to waiting for the new gear to come out and maybe we'll be better off then, I don't see that as a real solution to the problem either. Shaman heals have been steadily dropping off as healers get more geared, we were phenomenal when raids first started up in MSV, but I think its pretty apparent we don't scale very well with additional gear, mostly because of how useless our mastery is outside of the raid being at 30% HP or something which would indicate that we've done something horribly wrong and are about to wipe anyway. Something like absorbs scale incredibly well with gear, but having a mastery that benefits from players being at low HP when absorb mechanics are there to prevent such a thing from happening in the first place really just makes it frustrating as to why our mastery wasn't looked at IF the encounters in this expansion weren't designed to be pure raid wide damage.