Yes, yes, take it to a private message, or SMS text messaging, or get a room.
Please.
I've got another one for the list, which came from last time I played.
The worst online experiences (not "bad" worst, but more "annoying" worst) I had recently involve waiting on 'Left 4 Dead' for a match to start. (This point will become a splinter topic), because I invite my friends to join me to play as Infected, and anyone joining immediately leaves because only the human team is left to pick.
I'd like to point out that 'Left 4 Dead's Versus mode has you playing as the team you FIRST picked, then you swap teams to play as the other species. You essentially play through the same chapter twice.
THen there's when people join a game which is all ABOUT communication "Oh, no, here comes a Horde." "Help me, I've been latched by a Smoker"), and the guy is either French or mute.
By the time I can figure out how to say ("Help me, I have a Smoker constricting me." in French, I'll already have been killed.
And there's no point shouting at the mutes, because they can't even hear you without a headset. Which doubly sucks if they firnedly fire upon you and you want to swear at them.