What's a "good" elo??

Rank distribution - League of Legends
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According to League of Graphs, Plat + players (Ranked Solo/Duo) are _literally_ in the top 19% of all League players. Now, I understand that Plat (and Diamond) players sometimes don't understand wave manipulation/map awareness/other stuff pros are great at, but is it really fair to call anything that's below D2 "low elo"? This is not a rant. I'm curious what you guys think a "good" elo is, and why?
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