Muhammad did not claim to be just a historical figure. Islam claims Muhammad was a role model for all times so yes you can judge him based on modern standards.

Let me ask you would you live under these standards?

This is from the Pact of Umar. Umar is considered a role model as a Caliph by Muslim scholars.

"We shall not build, in our cities or in their neighborhood, new monasteries, Churches, convents, or monks' cells, nor shall we repair, by day or by night, such of them as fall in ruins or are situated in the quarters of the Muslims.

We shall keep our gates wide open for passersby and travelers. We shall give board and lodging to all Muslims who pass our way for three days.

We shall not give shelter in our churches or in our dwellings to any spy, nor bide him from the Muslims.

We shall not teach the Qur'an to our children.

We shall not manifest our religion publicly nor convert anyone to it. We shall not prevent any of our kin from entering Islam if they wish it.

We shall show respect toward the Muslims, and we shall rise from our seats when they wish to sit.

We shall not seek to resemble the Muslims by imitating any of their garments, the qalansuwa, the turban, footwear, or the parting of the hair. We shall not speak as they do, nor shall we adopt their kunyas.

We shall not mount on saddles, nor shall we gird swords nor bear any kind of arms nor carry them on our- persons.

We shall not engrave Arabic inscriptions on our seals.

We shall not sell fermented drinks.

We shall clip the fronts of our heads.

We shall always dress in the same way wherever we may be, and we shall bind the zunar round our waists

We shall not display our crosses or our books in the roads or markets of the Muslims. We shall use only clappers in our churches very softly. We shall not raise our voices when following our dead. We shall not show lights on any of the roads of the Muslims or in their markets. We shall not bury our dead near the Muslims.

We shall not take slaves who have been allotted to Muslims.

We shall not build houses overtopping the houses of the Muslims."