Abu Ahmad ibn Adi al-Jurjani: Most of his hadiths are hopefully straightforward, as he was accused of weakness more than Mubarak was accused of it.
Abu Bakr al-Bazzar: There is nothing wrong with his hadith.
Abu Bakr al-Bayhaqi: He is not an authority according to the scholars of hadith.
Abu Hatim al-Razi: He is dearer to me than al-Rabi' ibn Sabih.
Abu Hatim ibn Hibban al-Busti: He used to err.
Abu Dawud al-Sijistani: He concealed the identity of his shaykh a lot, and once said: If Mubarak said 'Hadathana' then he is reliable, and he used to conceal the identity of his shaykh.
Abu Zar'a al-Razi: He conceals the identity of his shaykh a lot, so if he said 'Hadathana' then he is trustworthy.
Abu Abd Allah al-Hakim al-Nishapuri: He is from the people of piety and knowledge to the extent that someone like him cannot be criticized, and once he said: Trustworthy, and said in the questions of Mas'ud ibn Ali al-Sijzi: They did not include him in the Sahihayn due to his poor memory.
Abu Amr ibn al-Sammak al-Daqqaq: He is above al-Rabi' ibn Sabih in what he heard from al-Hasan, except that he conceals the identity of his shaykh.
Ahmad ibn Hanbal: He used to elevate many hadiths, and once said: He is not like that, and once said: He was asked about Mubarak and al-Rabi' ibn Sabih, he said: How close they are, Mubarak used to make mursal narrations, and once said: He was asked about Mubarak and Ash'ath, he said: How close they are, Mubarak used to conceal the identity of his shaykh.
Ahmad ibn Shu'ayb al-Nasa'i: Weak.
Ahmad ibn Salih al-Jili: There is nothing wrong with him, and once said: He is not strong, his hadith is permissible.
Ibrahim ibn Ya'qub al-Jawzajani: His hadith is weakened, he is not from the people of meticulousness.
Ibn Hajar al-Asqalani: Truthful, he would conceal the identity of his shaykh (tadlis) and commit taswiyyah, and once said: He was a subject of disagreement, and he used to conceal the identity of his shaykh.
Al-Daraqutni: Very lenient, he makes many mistakes that are considered.
Al-Dhahabi: One of the scholars of Basra.
Zakaria ibn Yahya al-Saji: Truthful, but he was not a hafiz, there is weakness in him.
Sibṭ ibn al-'Ajami: He mentioned him in al-Tibyan for the names of those who conceal the identity of their shaykh.
Shu'ba ibn al-Hajjaj: He was asked about al-Mubarak ibn Fadalah and Rabi', so he said: Mubarak is dearer to me than him.
Abd al-Rahman ibn Mahdi: He abandoned him, and once said: We used to examine his hadiths where he would say 'Hadathana al-Hasan'.
Uffan ibn Muslim al-Saffar: Trustworthy, and he was from the ascetics.
Ali ibn al-Madini: Fairly good.
Muhammad ibn Sa'd Kathib al-Waqidi: There is weakness in him.
Nur al-Din al-Haythami: Very truthful.
Hashim ibn Bashir al-Wasiti: Trustworthy.
Yahya ibn Sa'id al-Qattan: He used to praise him well, and once said: He did not deem him agreeable.
Yahya ibn Ma'in: His hadith is weak, he is like al-Rabi' ibn Sabih in weakness, and once said: Fair, and once said: Trustworthy, and once said: There is nothing wrong with him, and once said: Moderate, and in the narration of Ibn Mahriz on his authority he said: He was not a liar.