The forums have a pretty large cross section of the player base.
Sure people come here to complain, but it doesn’t invalidate it as a reasonable tool.
It is like overbuff, people who don’t like the results it gives LOVE to say it’s sample size is too small, however, other trackers give the same results, and they are sampling different people.
As far as Mercy goes, you can see the massive drop in pick rate she had from v1.0 to current.
Her win rate used to be pretty bad, but, she had a MASSIVE following. Now she has a better win rate, but lose a whole lot of players.
The complains on the forums is good for giving you the reason that happened.
She had a unique playstyle designed within an inch of its life to work for the “lots of plates in the air” crowd.
She appealed to the ‘lots of plates in the air at once’ style of players.
The issue there is, you have to be really careful with gameplay for them. They are the people who play your faster shopkeeper style games, rythem shooters etc.
All good so far, but if change the hero so it no longer targets those players and don’t have a replacement, you will see what we saw here.
A LOT of complaining, and a massive drop in pick rates, even though the hero is ‘stronger’
I expect they lost the origional designer, and didn’t understand the choices that were made around the hero.