Being honest, I think the first iteration of the Mercy rework was probably the best or at least better.
Less AoE but more condensed damage.
I believe it was around 1600 total damage at that time but probably should've been a tad less.
Anywho, the current iteration is fine for crowd control and for carpet bombing.
A far more effective area denial, if I may add.
The closest thing to it now is a Janus's ground attack but that unit only deals damage in a "runway" whilst the Mercy has far greater AoE.
That being said, I feel like it still lacks a little bit of something.
It had more presense before it's rework, and everyone on the offensive had in the back of their mind, "Build AA".
I think that it could still use more tweaking to be in a better spot.
Maybe @FtXCommando's idea here for a mini-emp effect would be good, as well.
Sounds promising at first glance.
~ Stryker