Welcome!
Disclaimer
I’m not saying that she’s op or not, doesn’t matter if she’s indeed op, you can counter her or at least make her life a bit more miserable and harder (/less easy).
A small "introduction" of Counters of the Storm
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I wanted to have this "series" since Mephisto came out... on Youtube.
But since I still don't have good enough equipments to satisfy my own expectations for the video quality, but I still really wanted to start it finally, I decided I'll do so here, on the Forums.
So let’s hopp into how to counter our new op Hero!
What's in Qhira's kit?
- a situational “Ancient Spear” (Grappling Hook) as her Trait (25 sec)
- a good poke ability (has low cd (6 sec)) which deals little dmg the more range you utilise
- a dot which she can active for some heals but only on Heroes (8 sec)
- a unique swirling stun-mobility-knockback combo which seems to be the source of most of the complains but the most double edged (chain)sword in her entire kit (16 sec)
- and two strong but distruptable Heroics (US: 75 sec, FS: 40 sec, 10 sec on interrupt)
She has:
How to counter her?
At the laning phase, you counter her with Ranged Heroes who can poke-bully her out of the lane and negate any chance for her to use W for selfsustain.
Zagara, W build Ragnaros, Gul’dan (not W build, don’t make yourself a sitting duck against her) and Heroes who are not considered good on the lane (same for Qhira tbh) like Tracer, Genji are really good against her.
She can also be countered by our best laner Bruisers, like Malthael (who also can talent into anti heals which can be pretty useful even in teamfights against her).
(Also try to bait her E out near your gates so you can do a homerun :Đ )
You can also make her life a lot less safe with any kind of antiheal, making Ana the most scariest Healer for her, since she can just pop a Grenade when she planned to use her W on low hp to cheat Death (but no one can stop Death! 
) leaving her vulnerable and out of hope.
And because she can use her W for nice burst heals, that’s why you need to be extra careful when to keep facetanking low hp Qhiras, because it can be bait.
Let’s go to the meat’n’potatoes!
Her E!
It’s basically a “debuff”, which is Cleansable, so you can just purify Qhira off of your allies with a lot of Healers, leaving her out of position.
You can also Cleanse yourself with a lot of Tanks and Maiev (thanks to her Trait). The best frontline against Qhira is Johanna or Garrosh (allied throw helps as well).
You have no Cleanse?
Stasis effects like Time Trap, Crystal Aegis, Ice blocks!
No Ice block?
How about some nice blinks and teleports?
A Medivh who picked the Portal Mastery at lvl 1 can bait a Qhira out of existence!
Genji, Tracer, Zera, Mephisto, Illidan and others with dashes and nice screenjumps can take her into their teams/structures (or at least out of position) with ease.
You lack even all the blinks? No worries!
How about some nice movespeed bonuses so you still make that E risky for Qhira? Like with Lúcio (who also has Cleanse too) or Zarya/Aba with the speed shields!
With these tactics, Qhira will not feel safe to use her E on just anyone anytime, hindering her “terror” and impact.
Now let’s talk a bit about her Heroics.
Both is a channeled ability, so you can interrupt it.
At lvl 20 the Unrelenting Strikes can be tough, since it opens with a silence, but you can still counter the stun at the end the way you counter a Moshpit: Not getting caught, ranged CC.
And like every Hero -especially divers (which she’s kinda is)- CC, CC, CC! Not a joke. Playing Qhira just to be CC-d when you wanted to use your combo or self heal is annoying and can lead to a death.
There are some nice delayed CCs which you can use to screw her up, like Butcher’s Lamb to the Slaughter, or Tyrande’s E.
So... to what to pay attention to playing against her?
- Her selfheal when you think she’s low
- Denying/lowering her dot-spreading as much as possible
- Have a “cleasing ability” or “mobility” against her E
- Save CC for her Heroics
- Make sure she has her Trait up or not (if she does, save a CC for that)
And for the RavenLord’s sake… pls, don’t wander alone on the map when the enemy has a Bounty Hunter on their team -the fantasy was implemented really well- and no, you don’t need to be able to 1v1 her, this is a teamgame!
Who can remove Qhira's tether [E] from who?
Heroes who can do it on their own:
- Imperius
- Yrel (too lategame
- Fenix
- Maiev
- Blaze
- Alexstrasza
- Junkrat
- Garrosh
- Malthael
- D.va
- Genji
- Valeera
- Ragnaros (too lategame)
- Samuro
- Zarya
- Alarak
- Auriel
- Gul’dan (too lategame)
- Medivh (only close to max ranged Portal)
- Chromie
- Tracer
- Dehaka
- Cho’Gall
- Lunara
- Morales
- Rexxar
- Kharazim
- Leoric
- Butcher
- Johanna
- TLV
- Jaina
- Anub’arak
- Chen
- Murky
- Aba (not realistic that he needs to)
- ETC
- Kerrigan
- Nazeebo
- Hammer
- Tyrael
- Uther
- Tassadar
Heroes who can remove it from others:
- Zeratul
- Uther
- Tyrael
- Lili
- Rehgar
- Kharazim (kinda late game tho)
- Morales
- Chromie
- Medivh (only close to max ranged Portal)
- Auriel
- Lúcio
- Blaze
- WM
- Anduin
She may have a bit more HP than Thrall, but her survivability is actually worse.