According to a thread recently posted on Blizzard's forum page, a large number of players seem to be having issues with Australians servers on Overwatch.
Many in the thread, which is over 400 comments deep, claim they are being re-routed to United States servers, meaning their ping is leaping from 20-40ms to 150-200ms. A sizeable difference and, to most, borderline unplayable.
According to many, these issues have been exacerbated since the weekend. The above thread started almost two weeks ago, June 12. So far Blizzard has yet to officially comment and, as a result, some players are discussing refunds under Australian Consumer Law.
Worth noting: we checked the game from our office. We were able to get a game on local servers with ping of 2ms. It could be an ISP issue. This has happened in the past. Optus users had issues with Starcraft 2. One user noted he was getting low pings using Vodafone, but struggling with Optus.
But servers seem to have been inconsistent for most. We've reached out to Blizzard Australia locally, who have forwarded a note overseas. If we hear anything back we'll update.