Abu Ja'far al-'Uqayli: He mentioned a hadith for him, and said: He is not followed upon it
Abu Hatim ibn Hibban al-Busti: He mentioned him among the trustworthy
Abu Dawud al-Sijistani: Saduq (truthful), and he once said: Thiqah (reliable)
Abu Zur'ah al-Razi: He is not like that
Ahmad ibn Hanbal: I saw him narrate hadiths from Ammarah ibn Abi Hafsah, so I did not write them down, and our companions wrote them down. I left them out deliberately as if he weakened him
Ibn Hajar al-'Asqalani: Saduq (truthful), he has some mistakes
Authors of Tahrir Taqrib al-Tahdhib: Saduq (truthful) Hasan al-Hadith, Abu Dawud authenticated him, and Ibn Ma'in wrote from him
Yahya ibn Ma'in: Salih (good), and he once said: There is nothing wrong with him. It was said to him: Indeed, Muhammad ibn Marwan narrates from Hisham from al-Hasan that greeting (peace) suffices for fasting. So it is as if he considers him weak