Imo it's 90% about the attitude during the game. Start complaining about dmg of you opponents, mistakes of your team mates = +50% to loose. Try your best to stay positive during games. Just try to think about that, your playing an arena, somehow you/ your team mate start to complain about something. The fact that he is complaining means that something is going wrong. Ok so in a situation where you should actually try to find out how to win , the team is doing exactly the opposite thing. The result of a rage during a game / QQ & no focus = lower communication on the team, how many times we all started to speak less when someone started to argue about a mistake we did? This is just a stupid example but imo it's the most important thing which determinate the result of the game.