The main issues with pvp are leavers and kill stealers. As for ganging goes, people should know what their limits are, and not bum-rush the opposing team by themselves. On the flip-side, if the other team just OPs one enemy, who's by themself, then that's not cool either.

Nonetheless, these aren't rules, more like PvP courtesies. But it's not required.


random:
Mr. Popo: If you're going to find the Dragonballs, you'll have to depart to Namek, home of the Dragonballs.
Bulma: Namek? Well, that's a planet I've never heard of!
Mr. Popo: Oh will you look at that, a woman who doesn't know any better. Who woulda thought?
Krillin: Uh, actually, Mr. Popo, sir, to be fair about it... Up until recently, I haven't really heard of that planet either...
Mr. Popo: Oh will you look at that, a woman who doesn't know any better.
Krillin: AH! Dammit, walked right into that one...