I think Sparks is really fine, she has an incredible ability I’ve seen teams win because of the sparks that doesn’t die because it really on the back and assist a lot of kills with the revive gun.
I agree with the person that commented that the health packs should heal more but not heal her immediately as it is with sawbones. In that same aspect I also think Aura station should also heal her slower than it does her teammates. The only medic that should be able to heal as he does is phoenix because of the nature of the mercs ability.
Medic shouldn’t be offensive killing machines
Most offensive from top to bottom
1 phoenix
2 sawbones
3 aura
4 sparks