“On fire” for Mercy is screwed up, but don’t expect any changes to Mercy any time soon unfortunately. Jeff just replied there at long last.
The megathread is redundant but they insist on still keeping it up with the illusion that they are taking feedback onboard 
. It seems that win rate and pick rate only mean nerf/buff to them, not opinions or comments. The megathreads have been nothing but a time sink for both members and forum staff (e.g. moving Mercy related threads into it and making new megathreads). Frustrated is an understatement.