That is idiotic. Overall Math, science, life expectancy, infant mortality, median household income, labor force, and exports aren't and should never be what make (or made) America great.
The reason we are (were) the best is because of our freedom; economic, creative, individual. Everything else stemmed from that. It would be very difficult to compete with other countries in those categories while enjoying such freedom to do as we please, and run OUR OWN LIVES.
In such a gigantic free society, there are bound to be groups (that enjoy the freedom to fail) which skew those statistics.
Unfortunately (because of weak minded, ignorant followers) we're now joining the ranks of mediocre countries around the world.