He was called the greatest waka poet of his day, and criticized 'Goshui Wakashu' (Later Collection of Gleanings of Japanese Poetry' compiled by FUJIWARA no Michitoshi over the head of Tsunenobu, by writing 'Goshui-mondo' and 'Nan-goshui.'
当代一の歌人とされたが、経信をさしおいて藤原通俊が撰集した「後拾遺和歌集」に対して「後拾遺問答」・「難後拾遺」を著してこれを批判した。