This all depends on the person. Just like adults. I have raided with kids that were good and kids that were bad. The biggest issue I have personally seen regardless of age is people not listening and talking nonstop. My clan raids with my son and I and he does just fine. He wears a headset and listens to everyone and sometimes will talk. But honestly if he never spoke you wouldn't know he was a kid by the way he plays. When he does strike playlists I don't allow him to use a mic solely for the people who would be rude to him. Is he the best player? Sometimes. Is he the worst player? Sometimes. But he is always trying to help and knows how the fights go.