That’s not really an accurate summary of what people want. It’s a rather significant mess I’ll try to summarize it.
You’ve got two main groups of people with loads of splinter groups coming off of them:
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Those that have liked some iteration of Mercy
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Those that have never liked any of the iterations of Mercy all that much
Mercy’s original design utilized a healing beam that put out solid healing numbers, while also having excellent movement and survivability, and an ult that was short and potentially high impact with some decision making at most but not all skill levels.
Mercy’s new design has the same healing beam but, to balance out some of the new features the healing took a nerf, she’s got expanded movement capabilities, her ultimate has swapped to being a sustained ability that provides increased capabilities across the board including amplifying the ability to kill things, she’s now got resurrect on a cooldown that provides a potentially risky way to turn a fight at the cost of being unable to heal for a period of time and having limited mobility for the period of time that an attempt is active.
Depending on what drew someone to like/dislike Mercy the current version may be good , bad or sameish as you do have differences between the versions that may impact the appeal of the character
As the character presently is probably overpowered on consoles and only a little bit off balance on PC you don’t actually have much room to improve in any area without having to nerf something else which would lead to further conflicts as people like different things about the character and would not be pleased to see what they like getting nerfed.
Mercy’s performance is a little on the weak side on PC and appears to be a little bit on the overpowered side on consoles which can also lead to differences in interpretation.
Players tend to be more satisfied when the heros they like are overpowered and the heroes they dislike are weaker.
As a result, players that dislike a characters design may end up going quiet about it if the character isn’t in play much (as changing the character could easily make them more of a pain by making them more popular and not necessarily addressing what a person dislikes about a character or making it worse) and will be very loud if the characters they dislike are in play a ton.
Mercy also has a multitude of reasons people dislike/disliked her below are a few examples for some people only one applies but for many that dislike her it’s not just one thing:
Some people hate her beam
Some people hate that her kit is easy
Some people hate her regen
Some people hate her res on cool down
Some people hated her Mass Res
Some people hated her invulnerability
Some people hate res period
Some people hate her damage boost
Some people hate portions of her movement
Some people hate the hitbox on her gun
Some of these are also the same reason’s people like/liked the character so you can’t make both the people that like and dislike the character happy by changing them either. Additionally, any change that is a nerf would likely lead to a buff someplace else that would annoy another group of people that dislike her.
This isn’t a problem that has some nice easy solution that leaves everybody happy. You might be able to iterate changes/additions where less people are unhappy but, you’ll have a few broken eggs no matter how you do it.