Why would we want everyone to be diamond. A good player in pvp will outweigh random bad players in 99% of cases.. Just because you play pvp doesn't entitle you to be the most elite rank. A 50% win ratio should not deserve diamond status; you should require far higher than that, because better players or players who are more willing to talk to each other and make a strategy will win more. You can see this many times and throughout wolves den's short history. I'm not saying its impossible to be teamed with 'bad players' every game, but extremely unlikely, for instance I have a 80% win ratio in 50 games atm... Those 10 games I would consider having bad teammates, but I've won just as many from the other teams bad players....
TLDR: it's fine how it is, give advice to people, talk more, complain less