I only thank when I feel they're doing a good job. If you're healing but die every 20 seconds, never actually supercharging, then I'm not going to thank them. If they give me clutch heals or play well (that's not just pocketing a good player against a bad team) then I will probably thank.

^ Valid

I always thank, it’s kind to those few medic mains, and as a former medic main, I love it when they thank me