Most popular heroes on ladder at every rank and how often they actually win games (Nov 2018)

Against a good Pharah being pocketed it's just not enough. You can do about 1 shot per second, so that's 75 dps and Mercy heals at 50 health per second. So if you land every shot (which isn't going to happen) you'll still take forever to actually get Pharah down to zero. Even headshot + bodyshot isn't enough to kill a Pharah with a pocket Mercy (225 damage - 50 healing < Pharah's 200 HP).

So even in a situation where Pharah doesn't use the map to stay safe and you're hitting every shot she's still going to rain a lot of damage down onto your team before you can kill her.

Mei works against a Pharah but only if there's another hero that can deal more consistent damage to her to capitalize on when your icicles do hit.

/r/Overwatch Thread Parent