As much as I love playing Soraka and Janna ...

http://pm1.narvii.com/6096/4358a84000747c33b5bacba80a830c908a120c92_hq.jpg

We can't ignore the fact Janna has a 57% win rate and Soraka has a 54% win rate (which is going up as of patch 7.16)

While their kits don't look like they're a problem, it's the combination of items like and the keystone https://vignette2.wikia.nocookie.net/leagueoflegends/images/0/03/Windspeaker%27s_Blessing_mastery_2016.png/revision/latest?cb=20151103094744 that creates a huge problem. I'm not the best person at math, but I will try my best in showing just how ridiculous they are as of now. Let's look at one of Janna's abilities shall we?

https://vignette2.wikia.nocookie.net/leagueoflegends/images/9/99/Eye_of_the_Storm.png/revision/latest?cb=20170418180136 Eye of the Storm: ACTIVE: Janna shields the target allied champion or herself for 5 seconds, granting her target bonus attack damage while the shield holds. SHIELD STRENGTH: 80 / 120 / 160 / 200 / 240 (+ 70% AP) BONUS AD: 10 / 17.5 / 25 / 32.5 / 40 (+ 10% AP)

That doesn't seem too bad, pretty good but nothing to worry about ... until you combine items and the keystone too.

https://vignette2.wikia.nocookie.net/leagueoflegends/images/0/03/Windspeaker%27s_Blessing_mastery_2016.png/revision/latest?cb=20151103094744 Windspeaker's Blessing: Your heals and shields are 10% stronger. Additionally, heals and shields on allies increase your target's armor by 5 - 22 (based on level) and magic resistance by 2.5 - 11 (based on level) for 3 seconds.

https://vignette2.wikia.nocookie.net/leagueoflegends/images/4/47/Ardent_Censer_item.png/revision/latest?cb=20170506222400 Ardent Censer: Stats +50% base mana regeneration +60 ability power +10% cooldown reduction UNIQUE: +10% bonus healing and shielding power. UNIQUE: Heals and shields on allied champions (excluding yourself) enhance their basic attacks for 6 seconds. Granting them +25% attack speed and 25 bonus on-hit magic damage healing them for the same amount.

Basically, Janna can shield someone for 240 + 70% of her AP, along with a 20% shield boost from Ardent Censer and Windspeaker's Blessing. That's not adding the fact Ardent Censer increases the basic attacks (25% attack speed + 25 bonus magic damage) with Janna's E applying a 40 AD boost with 10% of her AP increasing that. So in the end ... Janna's E alone can make someone tanky as hell with a huge damage spike every 10 seconds, not including other items to shorten the cooldown on her power. We're not even taking into account who she's shielding, combined with her ADC's stats and items. It's no wonder a and for example, are god tier in terms of winning late game. You can't hurt the guy, Janna will blow you away with her tornado, all while that massive AD spike and his life steal is going to kill your entire team. Her kit fused with a few things literally makes her the hardest champion to counter because she's designed to keep people away from her allies WHILE they have a massive shield + AD spike ... meaning, she can do two incredibly game changing things at once, which is crazy since it's packed into one champion.

Now let's look at Soraka ... whom I love to main more but is also a problem too for League. Let's look at her core spell.

https://vignette2.wikia.nocookie.net/leagueoflegends/images/6/6f/Astral_Infusion.png/revision/latest?cb=20170818194809 Astral Infusion: ACTIVE: Soraka heals the target ally champion. HEAL: 80 / 110 / 140 / 170 / 200 (+ 60% AP)

While that may seem simple and nothing to worry about ... taking into items like Ardent Censer, the keystone Windspeaker's Blessing, and cooldown reduction .. Soraka can heal someone for 200 HP + 20% healing bonus from her item and keystone + 60% AP boost every 2 SECONDS. When Soraka reaches late game, with the right items and keystone, she can literally heal someone for over 400+ HP every TWO SECONDS. There's no way in hell a duo bot is going to kill a and duo because the insane amount of sustain that they have. Again this isn't taking into account the amount of lifesteal + items that Kog has, nor how Soraka can heal everyone instantly with her ultimate. Did I forget to mention her Enchanted Heal (when she procs Starcall and is in Rejuvenation mode), her ult will heal everyone for over 525 HP plus 82.5% of her AP boosting it. Hoooolllyyyy crap ... that's like if the entire team were in their fountain for 2-3 seconds worth of healing, THAT is how much Soraka can heal everyone if her build + items are done correctly.

http://www.reactiongifs.com/r/tldr1.gif

and are a problem because their cooldowns are very short, can literally out shield / heal any damage thrown their ally's way, and Janna has a kit that is incredibly strong since she can keep people away at all times from her allies while said ally has a massive shield with a big AD spike. No one can really do anything to stop the carry from killing them all with that massive shield / being healed and what's worse is that these two champions can keep doing it throughout the fight with little consequence since their CD's are so short. The only way to win is by killing them first, but doing so is also very difficult because they will likely have protection from their allies while you're taking a lot of hits trying to engage them.

Meaning, unless you can catch them out fast enough ... you will likely die trying to kill them and by the time you manage to, the REAL threats (ADC's, fed laner, ect.) will finish you off and be at full health to carry pushing the lanes or getting objectives. It's a lose / lose situation and that is why Janna and Soraka's win rates are rocketing because they're so incredibly useful and hard to punish at the same time. I love them, but I admit they're a huge problem and making the game really unfair for most champions who aren't easy to play with very high reward & low risk kits like theirs are.