middling vs not worth writing home about

middling

adj
  • Of intermediate or average size, position, or quality; mediocre. 

  • In fairly good health. 

adv
  • Fairly, moderately, somewhat. 

  • Not too badly, with modest success. 

noun
  • Something of intermediate or average size, position, or quality. 

  • Preceded by the: people of moderate means; members of the middle class. 

not worth writing home about

adj
  • Being nothing to write home about; unremarkable and mediocre. 

How often have the words middling and not worth writing home about occurred in a corpus of books? (source: Google Ngram Viewer )