Abu Ahmad ibn Adi al-Jurjani: His hadiths are written down. I haven't found any contradictions in what he narrates, but sometimes he mixes up the chains of narration and contradicts [other narrators].
Abu Bakr al-Bazzar: We don't know of anyone who abandoned his hadith except those with little knowledge.
Abu Ja'far al-'Uqayli: He is not followed.
Abu Hatim al-Razi: Weak in Hadith.
Abu Hatim ibn Hibban al-Busti: Extremely erroneous, very delusional.
Abu Dawud al-Sijistani: Weak.
Abu Zur'a al-Razi: Lenient.
Ahmad ibn Hanbal: Weak in Hadith. And once: He is better than Muhammad ibn Salim, but he is still weak.
Ahmad ibn Shu'ayb al-Nasai: Weak.
Ahmad ibn Salih al-Jili: Weak. His hadiths are written down. And once: He is alright, but not strong.
Ibn Hajar al-'Asqalani: Weak.
al-Daraqutni: Kufi, weak. And once: He is considered reliable. And once he said: Abandoned.
al-Dhahabi: Truthful.
Sufyan al-Thawri: Ash'ath is more established than Mujalid.
Abd al-Rahman ibn Mahdi: He did not narrate from him, and he mixed up his hadith.
Abd al-Rahman ibn Yusuf ibn Kharash: The weakest of the Ash'aths.
Uthman ibn Abi Shayba al-'Absi: Truthful. It was said: A proof? He said: No.
Muhammad ibn Isma'il al-Bukhari: Truthful, except that he makes mistakes.
Muhammad ibn Bashshar Bundar: He is not trustworthy.
Muhammad ibn Sa'd, the scribe of al-Waqidi: Weak in his hadith. And once: He is alright, but not strong.
Authors of Tahrir Taqrib al-Tahdhib: Weak, but he is considered reliable.
Yahya ibn Sa'id al-Qattan: Al-Hajjaj ibn Artat and Muhammad ibn Ishaq are equal in my view, and Ash'ath ibn Sawwar is below them.
Yahya ibn Ma'in: 'Abbas, Mu'awiya, and Ibn Mahriz narrated from Yahya who said Ash'ath ibn Sawwar is weak. And Abd Allah ibn Ahmad al-Dawraqi said I heard Yahya ibn Ma'in say Ash'ath ibn Sawwar is trustworthy. And in a narration by Ibn Mahriz: Ash'ath is more beloved to me than Isma'il ibn Muslim.