Abu Ahmad ibn Adi al-Jurjani: No one abandoned his narrations completely, but they included them in their Musnads and classifications. He criticized Ahmad ibn Hanbal for abandoning his narrations.
Abu Hatim ibn Hibban al-Busti: I considered his hadiths and found that what was narrated from Sinan ibn Sa'd resembles the hadiths of trustworthy narrators, while what was narrated from Sa'd ibn Sinan and Sa'id ibn Sinan contains Munkar (rejected) hadiths, as if they were two different people. Allah knows best.
Ahmad ibn Hanbal: According to a narration from his son, Abdullah, he said: 'I abandoned his hadiths because they are muddled and not well-preserved.' And according to a narration from Muhammad ibn Ali al-Warraq, he said: 'He narrated fifteen Munkar (rejected) hadiths. I do not know a single one of them.'
Ahmad ibn Shu'ayb al-Nasa'i: Munkar (rejected) in hadith, and once: 'He is not trustworthy'.
Ahmad ibn Salih al-Jili: Trustworthy
Ibrahim ibn Ya'qub al-Jawzajani: His hadiths are weak and do not resemble the hadiths of the people from Anas.
Ibn Hajar al-'Asqalani: Saduq (truthful) with some irregular narrations.
Al-Dhahabi: Not an authority
Muhammad ibn Ismail al-Bukhari: Acceptable, close to being a Hadith scholar.
Muhammad ibn Sa'd Katib al-Waqidi: Munkar (rejected) in hadith
Yahya ibn Ma'in: Trustworthy