Imam al-Sadiq in Mizan al-I'tidal,
"Bukhari did not use his hadith as Hujjah.
Yahya Ibn Sa'eed said: Mujalid is more beloved to me than him. And my nafs has something against him.
And Mus'ab said, Al-Darawardi said: Malik [Ibn Anas] didn't narrate from Ja'far until the Abbasids took control.
And Mus'ab Ibn Abdullah said:Malik didn't narrate from Ja'far until he narrated from someone with him.
And Ahmed Ibn Sa'd Ibn Abi Maryam said, I heard Yahya say: I wouldn't ask Yahya Ibn Sa'eed about Ja'far Ibn Muhammad.** So he said to me, 'Why don't you ask me about the hadith of Ja'far?' So I said, I don't want it.
And Ibn Ma'een said: He is Thiqah.
Then he said: Hafs Ibn Ghiyath went out once to Abadaan so the Basraiyun came to him and said, 'Do not narrate to us from 3, Ash'ath Ibn Abd al-Malik, Amr Ibn Ubayd, and Ja'far Ibn Muhammad.' So he [Hafs] said, 'As for Ash'ath, he is yours and I leave him for you all. As for Amr, you are more knowledgeable. As for Ja'far, If you were in Kufa,I would rather take from hammered slippers.
Mizan al-I'tidal, Vol.1, Page 414-415