Found this whilst searching the inter-webs, might be good to have on another screen if you find yourselves struggling against a specific hero.
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Original site is here
https://www.heropicker.com/overwatch-counters/
which give more info on what heroes are good on what map.
Nice one, this is useful info indeed. Continuing to play into one of your counters is one of the worst things you can do in the game tbh, can really hurt you and your team's game.