Abu Ahmad al-Hakim: His hadith is not reliable
Abu Ahmad ibn Adi al-Jurjani: He has some sound hadiths, but most of his hadiths are not followed by the trustworthy narrators, and he is weak as they described him
Abu Bakr al-Bazzar: He is not a hafiz, and his narrations are not considered if he narrates alone
Abu Bakr al-Bayhaqi: The Imams considered him weak, and he once said, 'He is accused of fabrication'
Abu Hatim al-Razi: Lenient in hadith, his hadith needs further examination
Abu Hatim ibn Hibban al-Busti: He made many mistakes and was extremely forgetful, to the point that some of his narrations contain contradictions that make one wonder if they were fabricated intentionally. My opinion is to disregard his narrations that contradict the trustworthy narrators and to consider those that do not contradict them. He is among those whom Allah, the Exalted, has chosen for good, because he is close to...
Abu Isa al-Tirmidhi: He made many mistakes in hadith
Abu Mushir al-Ghassani: He abandoned his hadith because of his opinion
Ahmad ibn Hanbal: His hadith is abandoned, and he denounced his hadiths. Al-Bayhaqi, in Ma'rifat al-Sunan wa al-Athar, narrated from Ahmad that he said: 'He is weak'
Ahmad ibn Shu'ayb al-Nasa'i: Weak, and once: 'He is not trustworthy'
Ahmad ibn Muhammad al-Khallal: Weak in hadith
Ibn Hajar al-Asqalani: Weak
Duhaym al-Dimashqi: Trustworthy, but he had some hadiths in which he made mistakes
Muhammad ibn Ismail al-Bukhari: His hadith contains munkar (rejected) narrations, and once: 'His hadith needs further examination, it is not acceptable'
Muhammad ibn Sa'd, the scribe of al-Waqidi: He narrates munkar (rejected) hadiths
Hashim ibn Bashir al-Wasiti: He praised him highly
Yahya ibn Ma'in: From the narration of al-Abbas, he said: 'His hadith is nothing.' And from the narration of Hisham ibn Ammar, he said: 'He is weak'
Yaqub ibn Sufyan al-Fasawi: He is concealed, and his hadith is lenient