Hey Baka-gaijin, I have a quick update for you!
Today I patched in automatic region selection (no more always routing traffic through US East) and MageQuit now takes ping into account with matchmaking as well. You will no longer matchmake with anyone with a ping higher than 160ms from your best region in quickplay (I assume this will be Melbourne for you). Ranked, unfortunately, doesn't enforce ping limitations because we don't have enough active ranked players to warrant the split, however, the automatic region selection will still find a better relay server for your ranked matches even if pings aren't restricted.