This game modes matchmaking is fine as long a it's solo vs solo. However, it tries to put solo and 2, 3, 4 and 5 man queues all into the same pool which COMPLETELY destroys the system and makes it non-functional. The majority of my games are 1 sided stomps from either side.
By having such bad matches in your "unranked" mode, which is the introductory mode for new players, you're actively making players stop PvPing entirely as their first introduction to PvP is nothing but uneven unfun games where you don't learn anything. It doesn't encourage people to queue for ranked - it does the opposite, it encourages them to give up on PvP all together.
I spend so much time adding people to my friend list to queue dodge their premade that it's gotten absurd.
Please look into revamping the unranked systems matchmaking if you'd like this game mode to gain players.