The perspective about the Mongol Empire that a European living in a country conquered by the Mongols is most likely to have is:
The Mongols were responsible for the murder of millions of people in their conquest of European countries.
This viewpoint reflects the likely sentiments of fear and resentment toward the destructive aspects of the Mongol invasions, which included violence and loss of life, rather than the more positive or neutral impacts such as trade and knowledge transfer.