I summon forth Macrohard/Elementuser to to spread the word how wide is thy matchmaking system "Fair Matches" and "Shorter Queues" in terms of mmr (min-max of player).
I'm wondering this because I have ended up losing about 5 games in row because I get as 1740mmr people that are 1550mmr.
I pass the baton to Jamestown. I don't really know much about the MM system, sorry!
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Look for my highlighted text (important information) and grey text (interesting but not required information).
Can't say how it actually works, but I hear it's just a preference. If you select fairer matches that doesn't mean you get closer MMR games, it just means you prefer it (At least that's what I read a while ago from a red)
When the system was first released, there was a red post detailing the way that the slider affects the MMR system (I have searched for this however my efforts have not proved... fruitful.)