not worth writing home about vs so-so

not worth writing home about

adj

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

so-so

adj

  • Neither good nor bad; tolerable, passable, indifferent. 

adv

  • Neither very well nor very poorly. 

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