Just have to ignore people complaining about champs. The only criticism I ever speak is if I think we'd be better off with another support, but I don't call out anyone. Team comp is fairly good to have on lockdown but at anything approaching pub play, the people on their strongest champs are usually gonna win anyway. I rotate heroes a lot based on map/enemy comp/our comp but I have like 8 I play relatively well so I can generally get away with it, and they're mostly diverse enough too.