@seida
This was when I was in beta, I joined a jp server due to wanting to actually beta test and not just play the game (work got in the way) and the few dungeons I did do I kept on getting players who were exactly like you describe it. Granted I realize not all of them were japanese players, there were a plethora from the other south east asia countries. Same issues with american/english speaking except when dealing with english speakers I knew they understood me when I'd shout boss. Or even auto texted boss 15 times to indicate they should stop fighting the adds and assist the archer with the boss. (2/3 bad exp. Not alot to go off of but enough to make me shy away from that server.)