Literally just look at the pvp leaderboard for each spec in solo shuffle. https://www.pvpleaderboard.com/leaderboards/solo/us
Less played specs such as augmentation, devastation, outlaw, frost, etc do not have enough players to populate their full spec leaderboard. This puts their low end at players who have queued 1 game. More popular specs like ret, disc priest, arms warrior, have their lowest rating at 1600-1700. Taking an average of the top 5000 is going to be wildly different for specs that have enough players to put #5000 at 1700, as compared to only having 3000 players total.
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