I know that I really shouldn't be the one to talk about being polite and courteous to the other team in Ballista (I've been known to get upset over the littlest things) but I've noticed that when people do Ballista, lots of times the match ends with someone /blacklisting someone else or people yelling and being enemies. I know sometimes it's frustrating to lose, especially when your team can't seem to cooperate, but the things some people say don't just go away at 0:00 when the match ends.
It's too bad we can't have a nice, friendly Ballista once in a while (I don't know how the Japanese handle it, but they seem a lot nicer when they play with us :P). I think if people would stop gloating after killing someone and try to cut down on the senseless shouting, there'd be a lot less "hurt feelings".
Just my opinion, I personally love Ballista, but I know something is going to go wrong every time I go.