pairing of players with far different rank should not be allowed cus it looks unfair to the team itself or the opponent team
indeed many solo players often face this, and it's unfortunate that the matchmaking system really needs to get better improvements specially prioritizing for solo player
Sorry for that to happen but as per the game rules, Mythics are allowed to match up with Legends. If you wanna avoid it, i'd recommend you to play with premades to completely avoid bad matchmaking.
Btw, i got 3 winstreak alredy idunno how can i meet 4 legends teammates,n then the enemy only 1 legend tier, four left is mythic also .. system broken already...