The new matchmaking system makes playing with a premade team almost impossible. Most of the time you join into empty servers that won't fill up. If you do have a full game half the other team will rage quit and the server will not fill it up.
Servers need to be able to merge or pull people from servers that are short until all possible games are max players.
You could always go back to the old wat until you work it out seeing how 95% of people vote random everytime.