No, I only said this was not one of our better eras, politically and militarily.
However the Southern Song was probably our greatest era, in terms of social mobility, general economic prosperity, education, 'industrial' output, inventiness, international trade and especially cultural prowess.
The loss of the north made the Southern Song a somewhat atypical Chinese dynasty. This is 'blue' maritime China at its best. Displaced to the Hangzhou area (to get out of the reach of marauding Jurchen forces), the Southern Song court turned its energies to the sea, and developed a vast marine fleet, to carry out international trade. So much so that the Chinese pushed the Arab and Indian merchants out of the international sea-trade in East and SE Asia. Remember that this was the China that developed paper money.
The educational level of the general populace also reached a new high, which was probably never exceeded until way into the PRC era. It was said that every village in the Hangzhou region had a school. There were chief ministers who came from the poorest backgrounds, due to the wide availability of literal education.
And food production was greatly boosted by the importation of some rice species fr SE Asia, that enabled double or even triple plantings in a year...