Please note: the rating does not reflect on Seferis (who is awesome); the rating reflects on his translators. 
 I had a class where the prof compared the 1972 original with the 1995 revision. Keeley and Sherrard redid their translations in the later edition and totally mangled the beauty of the previous version. The prof was so disgusted, she took the book off the syllabus. 
 I would really love to see what Aliki Barnstone would do with George Seferis' work. I have no knowledge of Greek, but her translations of Cavafy are the best I've seen.