The only game where rules were a heavy subject were CS and TFC. In tfc most of the rules were enforced by server admin and end up with the rule breaker getting kicked anyway.
I think L4D public servers is another good example. I cant wait to get back to the uk and play with some ocuk'ers ...
For example, I was playing on l4d with a russian guy, a random and a german guy. There was an issue with med packs with the russian guy and myself in the red. We find 1 health pack ... the russian guy (for some reason) heals me and picks up the kit. The german kicks off massively on voice 'you're a ******* noob etc.' He thinks i have taken the kit. I try to explain and he aint having it. The random guy then tk's him and thats the game ruined.
Its a shame, but sometimes people just have to take the keyboards out of the holsters and battle ... rage quitting is unfortunately not a new thing.