So, Soraka
Okay so maybe I'm missing something here, or I'm blinded by frustration. Soraka is a champion that seems to have borderline zero counterplay. From what I can tell the only way to effectively kill her is extremely long range burst that can burst through a relatively tanky build. I've played multiple games this week where Soraka and her adc were COMPLETELY and entirely shut down and essentially farmed as minions in bot lane only to seemingly hyper scale into a late game monster.
Soraka's laning phase is fine and weak if anything. The problem is her teamfight. She has absurd sustain for her team if you don't focus her. Now, any decent player that is reading this is getting annoyed that you're reading a post about someone stupid enough not to focus Soraka. I understand that she is an extremely high value target. She is nearly immune to poke wars between her q and w healing her self and her team. Hitting a Q on a group of enemy champions is not difficult. If you try to dps her team she will sustain her front lines far beyond your adc and mid damage.
If you have a burst oriented team she will ult halfway through your burst combo and you will find it extremely difficult to burst her team fast enough to keep her a nonfactor. If you have an assassin (the supposed counter to immobile high value targets) she will sit back with her aoe silence and drop it as soon as you use your gap closer making you completely useless. If you have a hard engage tank she will silence any follow up to the tanks initiation long enough to heal up any damage done by your tank who is now stuck in a close combat fight with Soraka's front line champions that are receiving endless heals. Morello's is a great item against heals, but only if you can get the team below 40% which is excruciatingly difficult against Soraka in the first place, let alone against her ult that removes grievous wounds BEFORE applying the ultimate global heal.
My first instinct was to take away her extremely strong teamfight presence by split pushing and creating a situation where her heals can not be applied to anyone in danger. This strategy is countered by her ultimate having an enormous heal on a global ability. My second thought was to bait her silence out and then engage while it is on cooldown. So I did that, only to find that her silence was only on a 9.6 second cooldown. Most gap closers have a similar cooldown which makes these type of engages very cyclic in nature. Even if you take zero damage "faking" an engage, which would be an accomplishment in itself, you now have less than 10 seconds for your gap closer to come off cooldown and for you to engage and kills soraka, through her q, through her ult, and through her team. So that is where my frustration with the champion is coming from, the ability for her to draw so much necessary focus while also having the tools to make focusing her extremely difficult.
That being said I'm obviously missing something and would like to hear about the way you guys have been playing against her effectively.
Additional thoughts following your input:
Blitzcrank can isolate a target from Soraka's team making it difficult and dangerous for her to attempt to save them. Her lack of hard engage tools also allow a stand-off situation where a blitzcrank can do well.
Long-Range hypercarries pose a problem to Soraka because they deal so much damage so quickly that she can't keep up. E.g. Jinx and Kog'maw
The meta seems to heavily favor Soraka because of the very strong top lane juggernauts in this patch. The prevalence of teleport also negates some of the potential aggression from opposing junglers because of how frequent top laners teleport to bot lane. This helps her to get to late game as well as supplies her with a strong frontline.
Her mid game seems to be her weak point where team fights are breaking out but she can't sustain her team as well as when she gets more items. This is definitely exploitable. It is a little annoying because players in solo queue don't know how to end games quickly until they get to very high elo.

(and even
if he dodges her silence properly) get to walk all over her team and do more dmg than she can heal through. Especially if they have a Blitz pulling her ADC out of healing range.
who has a slow thats much stronger plus higher damage and if he hits two things it stuns both targets.then soraka has a Silence this silence is easy to walk out of even if the target is slowed now she also gets a root which is good but the target needs to be CC'ed down to keep them in her feild long enough for them to get rooted which means its very unreliable in both laning and team fights.now take per say
he has an AOE silence that deals a lot of damage to peel for his carries plus he gets a knock up and a pull letting him chain CC one target to the ground.
soraka GOD like healing letting her create a miracle where other supports would simply have to leave there carries BUT she loses 10% of her health to do so plus her ult she also needs to be close to her adc to do this meaning the other team can focus her if they chose to but they never do...this is their fault since they don't understand soraka is a kind of "carry support" she is the center of a team honestly people should be devoting a whole team comp just to help soraka stay alive.but lets look at janna
she is almost the perfect disengaged support who has an ult that blows away all enemies that get onto her adc plus she heals all her team in it AND she can be good in any team comp soraka needs a team comp that has a strong front line since anyone with half a brain knows to focus her since she has to build AP to matter.
overall i dont understand why people see soraka as over powered since she is probably at her most balanced this season lol she was nerfed and reworked so that she cant solo lane at all and cant jungle
. It's also important to punish her if she uses her silence aggressively, but that requires the Soraka to play poorly.
all at reduced CD because she's going 21 in utility. She also has easy access to 270 second
bonus much more easily than many other champs, since she doesn't enter combat by healing an ally. I think a nerf to this safety is in order.
lanning phase is oppressive,
just allow the adc to play reckless and have little to zero consequences but still is manageable..