Yes, definately. It is a matter of behaviour towards other and being fair. Anyone who uses the argument that it is just a game fails to see that a game is an extension of the real life and that you're dealing with real persons here. There is no difference between game/real life when it comes to social contact. The biggest difference is that there is really nothing stopping you from behaving in any way you please, which really makes it admirable that some people actually are capable of being friendly and fair towards others.
This is what honour in essence is.