Mercy before her rework was the most picked support but was “balanced” by the eyes of the forums, because she didn’t have the pickrate that she has now. Before her rework, Zen and Lucio were in the meta, and Ana was still at a nice spot even with her 60 damage.
http://www.omnicmeta.com/2017/07/top-hero-mains-s5-pc.html
After Mercy’s buff, Lucio went sh*t mode, Zen became a must pick as long as the first Mercy meta started and Ana is being overshadowed by Mercy. Moira was added to the game and up until season 10 Moira was still in a good spot, and then the armor meta came, many shields were added and stuns became a huge part of the game, and because of that Moira is being overshadowed by Mercy at diamond all the way up to gm (Ana has more pickrate then her, while still being at a “not picked at all state”). And Brig, the season 10 “MOST OP SUPPORT PLEASE NERF” is being picked in the 2nd dps slot.
yet the forums
"Mercy is not the problem, it's just that the other supports are weak"
Zen has been meta for 7 seasons (4 , 5, 6, 7, 8, 9, 10), while Mercy was only for 5.67 seasons in the short seasons (2/3 of 6, 7, 8, 9, 10).
yet the forums:
"Zen is just favoured by the meta and Mercy he is balanced, and Mercy is balanced too"
(the last one is true but not all of it, Grav dragon has only one counters which is Zen’s true, but he is still very good without a Mercy)
disclaimer: not all of the people on the forums give those opinions, but they are very popular.
I can give many more examples of this, I’m just showing the main ones.
I do believe that the Zen and Mercy need a nerf and not the other supports buffed, because it will result in a power creep.
