What is the Match making system?

As the title says how does it work? i have a friend who am i trying to teach how to play and we are given nothing but smurf accounts and he is getting destroyed. Also we are getting matched with new people in our team and in the enemy we have now had multiple games where there were level 288's WHAT THE HELL!??!?! our team feeds every game and get matched against stuff he just can't fight, it's put him off the game and i don't blame him.
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