You cannot leave the Lobby on 4v4. I've ben waiting 5 minutes for Teammates but the game never started. If you want to leave the lobby you have to restart the whole game (happened 5 of 6 times). This should not happen in the final release
Totally with you here. Was about to write the same. The matchmaking takes really long even if the lobby is full. You should be able to leave the lobby in any gamemode without needing to restart the whole game.