Abu Ahmad ibn 'Adi al-Jurjani: He plagiarizes hadith and elevates hadiths. He narrated hadiths from prominent figures that are not preserved from them. He has many hadiths, some of which are plagiarized from reliable sources, some from suspended sources that he elevated, and some he added to their chains of narration, making weak narrators into trustworthy ones. He does this frequently. I have limited myself to mentioning only a portion of his fabrications and fallacies as evidence, as they are numerous, to serve as an example of his many narrations.
Abu Bakr al-Barqani: He is not an authority because I saw most of our sheikhs say that his hadith is rejected.
Abu Hatim al-Razi: He would not say anything but good about him.
Abu Hatim ibn Hibban al-Busti: He may have erred.
Abu Zur'ah al-Razi: He would not say anything but good about him.
Abu Ya'la al-Khalili: They criticized him regarding hadiths.
Ahmad ibn Hanbal: I do not know him except as trustworthy.
Ahmad ibn Shu'ayb al-Nasa'i: He is insignificant.
Ibn Abi Hatim al-Razi: People spoke about him, so I refrained from narrating from him.
al-Hadrami: Liar.
al-Darqutni: Among those who spoke about him and criticized him was Yahya ibn Ma'in.
Uthman ibn Abi Shaybah al-'Absi: I am the most knowledgeable of people about him. He is trustworthy, but he is greedy and practices tadlis.
Muslim ibn al-Qasim al-Andalusi: Weak.
Yahya ibn Ma'in: A liar, wicked, not trustworthy, nor reliable. He drinks alcohol and takes people's money. And once: A liar who only begets liars. And once: He used to call him: Abu al-'Uruq al-Jallad.