There's no momentum changers, no "turning the tide". If you say have a guy giveup 3 kills in the first 4-5 minutes, the game is effectively over. It's best just to say GG and find a competetive game.
To the people that say there is no "turning the tide" games, you are absolutely wrong. You either honestly do not know how to play or have a bad teammate.
My friend and I were playing in a 3v3 game a few days ago on Levi. Our 3rd guy dropped about 20/30 minutes in. I was Sedna and my friend was Erebus. We were absolutely overwhelmed at our base for literally 10 minutes, our citadel was down to 8000 HP. We had literally a small amount of time before losing. The opposing team did not focus fire and we held it together, we killed each of their Demigods one by one and pushed them back. With that money, we spend it on upgrades and got giants. He pushed up with the units, I got flags we lost and by that time the giants had overwhelmed THEIR base and completely turned the tide of the game. I came in to fight with my friend and we won it.
He and I ended up dying only like twice.
Do not say there is no "turning tides" of games. There is. Just know your character and know how to play with your team. Whether or not they know how to do the same is based on luck, you can still stay with them and assist in kills.
If you want to complain, complain about people not complementing people on how they play or saying "gg" and "gl hf".