Is it based on win loss ratio? Like if i lost a few matches at less than 1k for example But then me and my partner started improving and winning more. Will these old matches be a burden on our rating once we get good? Should we remake team or stick with it?
Arena is based on matchmaking rating (mmr). This goes up or down when you win based on the other team's mmr. After enough games, your team rating should eventually roughly match your mmr. There is no reason to remake because the matching system will automatically push you to a 50% win rate. Plus, your mmr stays with you, so you'd just have to grind a new team rating up.