Abu Hatim al-Razi: Trustworthy
Abu Dawud al-Sijistani: He memorizes
Ibn Hajar al-Asqalani: Trustworthy Haafiz
Abd al-Baqi ibn Qani' al-Baghdadi: Trustworthy
Ali ibn al-Madini: I never saw him seeking Hadith, they were only seeking poetry, Muthanna is more preferable to me than him
Yahya ibn Ma'in: He is not a Hadith scholar, he is nothing