This was simply a reply to someone but since it got too long, I thinks it’s better to post it as new thread.
Ok so first, I think it’s usefull to say that I’m not a mercy main since the rework went live. I now main Lucio and start getting a liking on Zen.
Just to say, I don’t really care about Mercy anymore and I probably won’t play her again.
So let’s get started :
While I do agree I’ve read some insane posts that would make Mercy OP, these are definitely not 99% of them !
Some people say that reverting Mercy would make her OP again but I simply cannot agree with you on it.
Yes a lot of Mercy mains want a revert, but no it wouldn’t make her OP.
1. Pre-rework Mercy
1.1 Story time :
Do you remember that when Ana was released (and slightly buffed), mercy was considered a troll pick. Yeah a troll pick ! So much so that they added the invulnerability after the rez aka “the golden age of Mercy” as some would say.
And that was the moment everything went wrong : Ana was nerfed to the ground to point it was insulting to Ana main and triple tanks meta was quickly remplaced by something somewhat worse, the Dive meta.
The thing is, with ana out, there was only one main healer left that could survive the Dive and it was Mercy thanks to her high mobility (GA).
1.2 Lies, intox and missunderstandings :
With mercy being the sole main support available, the grudge against Mercy started to slowly but surely grow due to a few intox and missunderstandings.
Hide and res :
"Hide and res" was an exploit of the … efficient … SR system in place at the time. It never was supposed to be viable strat, but some Mercy players noticed that they could use it to climb the ladder.
A lot of people mistake “Hide and res” which implies to literally do nothing after getting ult, just to wait that your team dies to optimise the res ratio with something that is more like “Cover and res” which implies to take a safe spot right when an ult fest begins and only at that moment exactly like a DPS would do.
Huge res vs tempo res :
"Huge res" not only was uncommon but often reveal a poor team play or game sense from both team. Your team for getting caught in a zarya grav/ rein’s KD and other factors like poor healing, their team for not seeking you first or at least bait the tempo res.
"Tempo res" (oh oh oh what a transition) is what most Mercy player did, ressing 1 to 3 players usually in the middle of team fight and changing the course of the game that way. Tempo res was exactly what made Mercy so good to play. Knowing when to Tempo res rested on knowing who had ult and when, FOR BOTH TEAM ! That was the big difference between good and bad Mercy player. The ennemy team could bait the res by doing picks and the Mercy player had to know if it was worth to res or not.
OTP, boosted and [insert insult of your choice]:
Here is something that really infuriate me … If you look at my play time on Mercy in competitive, you’ll probably notice how high it is and conclude there we go, “another mercy otp”.
So yes but no ma friend … as a support main you surely realise how often no one want to heal it’s a shame isn’t it. The truth (in my case) is that I’m a mercy main, a Pharah main, a Lucio main, a … wait, I actually can flex 6 to 10 characters but 95% of the time I get to play supports, then tanks then DPS (I’m decent on Pharah) !
So listen carefully you little and fragile thing (not you Aked 
) if you see in your team 2 - 5 Mercy main/otp, don’t start with the defeated c*** syndrome and try to win, because who knows, they might better than you in your category !
2. Mercy 2.0
2.1 Wioty
It’s like an Oscar but for the Worst Idea Of The Year.
Mercy 2.0 is the very incarnation of the “Sounds good, doesn’t work” with a little tweak, IT DOESN’T SOUND GOOD AT ALL !!!
By giving to Mercy the ability to res every 30 seconds + additionnal res with Valkyrie, the very purpose of the strategic tempo res was gone.
Mercy obviously became overpowered (still laughing at the dumbasses saying “bohoo mercy otp will fall down to bronze where they belong”).
A failure of that extent is beyond my imagination !
Not only she became overpowered increasing the hatred toward Mercy players but she became awfully dumb to play, just a friggin res bot! Yeah a res bot, no need to think if it’s ok or not to res, who cares it’s on CD now …
Worst, supports player that don’t like Mercy were forced to play her, which was not what was wanted at all !
What is the difference between the good and bad Mercy 2.0 players ? Barely noticable …
(To be totally honest with you I stopped playing Mercy 2.0 after a few hours, I was disgusted. It was fun for some, not for me. I only play her if it’s an absolute necessity and nothing else).
2.2 Valkyrie and res
The res is, as an ability, still stronger than Valkyrie. How could the devs not realise that is beyond me. And what was Valkyrie, just a lame ult, so pathetic you used it to res, hide (ironic isn’t it) or cover. Did someone say ult economy, disappear you fool, we don’t want this here.
I might add some stuff about her gameplay later but honestly, there is nothing interesting to say.
3 Post-Nerf Mercy
3.1 Viable or not that is the question
Well, Mercy is still usefull because of consistant healing, she’s balanced since she cannot res much but dear god she’s plain.
One good side : now you can pop-up Valkyrie when you want, since it doesn’t really matter.
3.2 A future ?
No it was stolen not so long ago by a blue post.
I’m a partisant of the tweaked revert, so the crybabies can have an oppotunity to kill her before res with their glorious mechanical skill, if it’s enough to compensate for their not so glorious game sense.
Here some examples :
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LoS (Lign of Sight), suppressing the res behind a wall that made some people furious.
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A cast time (1 - 2s) without altering the movement speed.
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Removing invulnerability after res and/or remplace with a damage reduction or a shield etc.
There are many other examples and I’m not here to tell you all of them.
Overwatch was one of my favorite game, but after all that, I have lost my trust not only in the Overwatch team but in Blizzard in general. I play way less than before and when I do it’s mostly custom games, where I manage to have fun.
Still I promised myself that Overwatch was and is the last product I brought from that company.
Have a good day, I hope this help you.