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Take a look at my last two games. Both ranked 3v3. 1st one, the other team has a person who is 200 points above our average. 2nd one, the other team's average Elo is around 150 points higher than ours. Both quick queues, so inb4 long queue decreases the closeness of your match.
Fix your algorithm. Gaps like that are unacceptable in ranked.
P.S. My team's Elos are very close together, so we're not creating some kind of huge challenge for MM to handle.