I think I more fit into a mediator role then mod one, though I still have that impulse to jump into an argument and try to stop it, or stop what I think will become an argument.
I also do my best to keep within the rules, and if I see someone else blatantly breaking them I'll probably remind them of whatever rule and tell them to go back and read the rules. I even do that in games like Red Orchestra 2 depending on the server I'm on, it's just kind of developed into a habit that I have.