The game isn't over until it's over. I don't think you guys realize how much momentum carries a players skill. If you're down 6-7 rounds in a row at the first half, you can easily come back by stopping momentum and building up your own teams momentum. It's amazing psychologically how much it breaks the enemy team when they start losing many rounds in a row after feeling unstoppable and how much worse they start to play. Seriously, stop quitting before it's over every game is winnable unless your team is literally trolling.