Somebody could say fantasy fiction inspired in 1001 nights and near east may be too stereotyped, but if we start to watch spots to promote tourism in those countries, then that exotic touch is one of the main keys to attrack vistors. Of course when we are creating our own fantasy kingdom, then we use our own sytle, for example in Disney's Aladin when the main couple married, Jasmine wears the classic white dress. Nobody is going to wonder how is a Muslim wedding. "Orientalism" hasn't to be alway any thing wrong.
If there are raids in Zakara to catch slaves, I guess we can blame the khaasta, an extraplanar reptilian race. (If my words may offended any reptilian, please accept my most hipocrite apologies).
Other potential controversy is about the national invasions. Using the RPG for allegories of colonialism or international conflicts may be "getting into a chemise of thirty feet" ( = meddling in controversial issues, a chemise in a castle is the wall between two towers, and challening zone for attackers in a siege). If somebody complains about being a victim of historical injustices then other can answer about the time when those were the attackers against others.
The History may be very complicated some times. In the book "the crusades throught Arabian eyes" by Amin Alouf this told once there was a Christian-Muslim alliance against a second Christian-Muslim alliance. (The fitna or civil war among Muslims weren't rare in those time, and the relation between a first and a second wave of crusaders weren't too good). In the action-live movie of "Assasin's Creed" the flashback is about the conquest of Granada, the last remain of al-Andalus, by the Catholic kings. They aren't going to tell the Muslim king, Muley Hacen, was the guilty who started the war, and once Boadbil the little, the last Granadian king, was catched by the Christians, and after paying a rescue and some concessions he was returned to Granada, because the Catholic kings knew like this the civil war between Boadbil the little and his father Muley Hacen would continue. Boadbil wasn't happy because Isabel de Solis/Zoraya the new favorite of his father was going to be the mother of the heir. (If this sounds as a soap opera you can't guess what happened in the last years of al-Andalus kingdom and Omeya dinasty).
If you use a character for comedy tone, based in a historical character, al-Hakim, you can offend the Druzes who really believe he was a saint man. Technically al-Hakim was the responsible of the crusaders because he destroyed the temple of the holy sepulchre, the tomb of Christ.
The famous pirate Barbarrosa was a true historical character, but he wasn't an English corsair, but Otoman (with Greek blood), and they were slave traffickers.
There was an episode of "Hercules: the legendary journeys" about the slavery, with Lucy Liu.
Hercules saves a woman from slavery and then must help to free her fiancee from the slavers. As the story opens group of people are walking along a beach, among them are Cyrus and Oi-lan. Although Cyrus is suspicious of their leader, Belus, Oi-lan and the others assure him they are being led to...