BlueTracker

overwatch does not use any analysis of chat (voice or text) for matchmaking.

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without going overly into details, overwatch match makes on:

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--your matchmaking rating (MMR) - this is mostly affected by win/loss, with variance applied for certain conditions (i.e. brand new player, among other things)

--your region

--your ping

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again, that's overly simplified. but that's basically it.