I just want to mention medals may not, or may, mean much.
I've had games where I was playing S76, in ranked and dps isn't my main role, which I had 3 gold metals and I have terrible sustained aim (though I am good at Widow/hanzo).
I was being shitty as usual with S76 and I still had 3 gold metals. That doesn't mean I played well. It doesn't. I played shit. What this says is that my team as a whole probably played even worse than I did.
When a player that isn't playing good in your team gets 3 gold medals. That says something not about that person but about your team as a whole.
So no, medals aren't indicative of you being super good. At most, they're indicative of how well your team perfomed, like Endus said.