Does OpenDota only have access to public profiles? If so it's skewed upwards. The true 50th percentile is probably a bit lower in that case.
It's skewed to the right because a lot of 1-3k players wouldn't really be proud enough to show their MMR anyway.
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According to OpenDota's site, the average MMR has been increased.
Archon 4 (and 5) is in the top 50-55% percentile, which is 3 to 3.4k MMR.
According to 3 different sites, the top 50-55% percentile was 2.4-2.6k mmr before the update.
Also, with so many complaints about 7k and 6k's being dropped almost a thousand MMR points, I guessed that the same thing happened to alot of 4k mmr players (though probably on a smaller scale, like 500 mmr).
Despite that, I don't feel as though DotA's average MMR has risen THAT much. Maybe in a couple of weeks, OpenDota's charts will average out a bit better. I guess the majority of players to re-calibrate quickly are those who take DotA a little more seriously, resulting in an higher averages for now.
https://www.opendota.com/distributions
VS.
https://www.reddit.com/r/DotA2/comments/6n3z4e/bishofs_mmr_to_percentile_table/ (4 months old).