Deadlock's matchmaking has come a long way since the MOBA exploded in popularity among playtesters a few months ago. The first big change happened when Valve added ranked play, which corralled players into 11 ranks to better suit their skill level. However, that led to some issues that have now been more or less ironed out in the latest update...
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Valve gets closer to perfecting Deadlock's matchmaking, which will now account for your strengths and weaknesses with each hero
Source: PC Gamer (opens in a new tab)