The transportation system in Gwangju is in general pretty bad. There has been talk for years about expanding the subway system, but the taxi and bus lobbyists are a powerful force. So instead, there is just a terrible mess during rush hour.
I've found most of the drivers to be good. On slow days they are even outgoing and friendly. Some may drive a little agressively, but I think they have to, to keep the busses on schedule.