The new system is terrible and needs to go away. To have this system you might as well make the matchmaking be 100% random. Because right now it does the oposite of what's it's ment to do.

You go higher on rating thinking you will scape the new players and find more balanced matches to find out that it's even worst than before because the system will see you are high and usually give you 1 or 2 new players wich is pretty much a free loss specially if it's a healer. If the game can't handle a rating system just remove it or give us 4v4 training wich is really way more needed than 8v8.