This influx is apparently causing servers to lock up and give the infamous Error 37. This is, in turn, pissing off Korean players who are blaming Chinese gamers for the connection problems. That's why some Korean Diablo III players are even calling for Chinese players to be banned from the servers—something that is obviously pissing off paying players in Taiwan, who are getting lumped in with the Mainlanders.
According to Tech in Asia, the official Korean Diablo III site is becoming a multi-lingual feud with Chinese, Taiwanese, and Korean players going at it. Blizzard is looking for a workaround that will please gamers in all three countries. I know where it can start: getting rid of Error 37. Just a suggestion!