Pretty much every team over the past 2 decades could say the same thing...unlike popular belief, teams don't consistently draft great over long periods of time. Sometimes it goes in spurts where you might have 2 or 3 really good drafts, but often times those are followed by 2 or 3 meh ones. Over 20 years(decades as you say), it mostly balances out.
Sorry to blow your premise up, but that pretty much applies unilaterally.