Who Maestro counters:

[Archeol]

He destroys Hibana's shock pellets and Thermite's, I'd say this is a hard counter.

He destroys Twitch's drone if he can shoot it (never really done it, but it works on normal drones and I assume it works on her's too). I'd say hard counter.

He can shoot stationary operators, like say Maverick as he's blowtorching, preventing him from really using his gadget. Soft counter i guess. Perhaps even for operators who pull out a gadget weapon (like zofia, capitao, nomad.... technically ash and hibana but idk if they should count, especially ash) and cant destroy the Evil Eye while using those gadgets. Thermite even, since he has to pull out and plant his gadget.

Minor counter against shield ops, forcing them to turn around, or expose themselves to shoot the cam, or Maestro (with his Evil Eye) aims for the parts not covered by the shield front-side.

Minor counter to glaz since his Evil Eye can see through smoke which glaz relies on to use his gadget

[Archeol]

Actually, i have destroyed twitch's drones. many times. the other day in fact.