FormerlyHemlock
Hero
I'm doing it slightly differently... I have been slowly re-writing all the CR10+ monsters in the monster manual to actually follow the CR rules. The fact that Dragons have wildly differing CR numbers and often have the same effective stats is what started me down the path (Blue and Green Dragons were some of the most obvious that made me start looking at it closer).
I'm making direct MM page replacements to fit into my spiral bound monster manual (after all the pages fell out).
I'm AFB so can't check the details of DMG CR calculation, but even discounting Frightful Presence, Legendary Resistances, and the breath weapon and just plugging in the Adult Blue Dragon's raw damage numbers into http://1-dot-encounter-planner.appspot.com/quick-monster-stats.html gets me a CR of 15, vs. a book CR of 16. Once you account for all the things I skipped, I doubt not that the CR of 16 is quite correct by DMG rules. (Whether DMG CR rules are an accurate measure of monster strength is, however, a completely different story. IMO 5E CR is mostly meaningless except for calculating kill XP, since monsters of disparate actual strengths can all wind up with the same official CR.)
Just checking: you realize that Legendary Actions increase offensive CR just like normal attacks do, don't you? At least half of the dragon's offensive CR comes from the 3x tail attacks it makes every round. When I try to imagine why you would think dragons are over-CR'ed, the best hypothesis I can come up with is that you might perhaps be overlooking legendary actions in your CR calculations.
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