We've just deployed another matchmaker update. Only 1 change on this one:
Since the matchmaker has routinely been putting new players (below _segregationLow) into matches 100+MMR points higher than their own skill, we've put in a hard threshold at the _segregationLow number, which is currenly 1340. The goal is to get new players into matches that are super-close to their skill level, which, as we all remember, 100MMR points is a huge deal when you're brand new. Just 3 matches is a big deal.
We also added more resolution into time spent waiting in queue, so it'll be useful a bit later on.
Here's what we were seeing that made it seem wise to make an effort to improve our brand new players' first few matches. High skill players typically get matched to lower-skill matches, and everyone else typically gets into harder matches, with our poor newest players getting it most. Hopefully this change today compresses the MMR spread within matches a bit more. Btw, that low point right at "Fri 06" is about where we launched the previous update.