Was Yazid ibn Mu'awiyah a drunkard and sadist, and not truly a Muslim?

Yazid ibn Mu'awiyah assumed power after his father in Rajab of the year 60 AH, at the age of thirty-three. His reign lasted less than four years. He began his rule with the killing of Al-Husayn and concluded it with the Battle of al-Harrah, which made people despise him. Yazid is among those whom we neither revile nor love. Sheikh al-Islam Ibn Taymiyyah clarified that people differed regarding him into three factions: - The first party: They said he was a disbeliever, a hypocrite, and sought to kill Al-Husayn. This is the view of the Rawafid (Shi'a). - The second party: They thought he was a righteous man and a just Imam, and that he was among the Companions. Some of them even preferred him over Abu Bakr and Umar. This is a false view. - The third party: He was a king among the kings of the Muslims, having good deeds and bad deeds, and was not a disbeliever. However, due to him, what happened concerning the death of Al-Husayn occurred, and he did what he did to the people of al-Harrah. This is the view of the general body of people of intellect, knowledge, and the Sunnah.

They also differed into three factions: a faction that cursed him, a faction that loved him, and a faction that neither reviled him nor loved him. This is what is explicitly stated from Imam Ahmad ibn Hanbal, and it is the position of the moderate among his companions and all other Muslims.