its because of the "by nation" thingy, when go to the other faction their chat is like smashed out and you don't understand what they are trying to say then at one moment they are killing you lol
same as RF with the "race" thing
So far I have played Perfect world and it gives a great battle between players to PK and PVP with others. The game play was nice and evenly distributed of characters ability and their advantages and dis advantages..
as well as Neosteam has nice PVP and PK features where you can interact with players such as having their grinding session and to kill them without prior notice. hahaha and more is you can even gather important items and your fame upon having Pk session and PVP event ^_^