Abu Ahmad al-Hakim: Denier of Hadith
Abu Ahmad ibn Adi al-Jurjani: His general narrations, especially those from Yahya ibn Abi Kathir, are not supported by reliable narrators. He narrates many Hadiths solely from Yahya, and he is closer to weakness than to truthfulness.
Abu Bakr al-Barqani: Abandoned
Abu Bakr al-Bazzar: Denier of Hadith
Abu Bakr al-Bayhaqi: Not strong
Abu Hatim ibn Hibban al-Busti: He was among those who narrated fabricated reports from reliable Imams. It is not permissible to mention him in books except to criticize him, and his Hadiths should not be written except as a matter of astonishment. He is the one known as Umar ibn Abdullah ibn Abi Khath'am.
Abu Dawud al-Sijistani: Weak, and in another narration: He is not bad
Abu Zur'ah al-Razi: Lenient in Hadith
Abu Muhammad ibn Hazm al-Zahiri: Fallen
Abu Nuaym al-Asbahani: He narrated munkar (rejected) Hadiths from Yahya ibn Abi Kathir and others.
Ahmad ibn Hanbal: His Hadiths are weak. He narrates munkar Hadiths from Yahya ibn Abi Kathir. His Hadiths are not upright. And once: His Hadiths are worthless.
Ahmad ibn Shuayb al-Nasa'i: Not trustworthy
Ahmad ibn Salih al-Jili: He is fine
Ibn Hajar al-Asqalani: Weak
al-Daraqutni: Not strong, and once: Weak
al-Dhahabi: Several scholars considered him lenient
Muhammad ibn Isma'il al-Bukhari: His narrations from Yahya ibn Abi Kathir are contradictory and not reliable
Yahya ibn Ma'in: Weak, and once: He is nothing
Yaqub ibn Sufyan al-Faswi: Lenient in his Hadith