Abu Ahmad ibn Adi al-Jurjani: He has some authentic hadiths, some strange ones, and some rejected ones.
Abu Bakr al-Bazzar: He was not strong in Hadith.
Abu Ja'far al-'Uqayli: His hadiths are not followed.
Abu Hatim al-Razi: Weak in Hadith
Abu Hatim ibn Hibban al-Busti: He narrates rejected hadiths from well-known narrators. It is not permissible to use his hadiths as evidence if he is the sole narrator. Sometimes he reverses the chains of narration and attributes hadiths to the wrong people.
Abu Zur'ah al-Razi: He is not strong.
Ahmad ibn Hanbal: He narrated rejected hadiths.
Al-Daraqutni: Weak
Wakee' ibn al-Jarrah: He is okay.