Mongols thought of themselves as loyal, have eternal friendships, heroic, religious and very harmonious according to the passage: Secret History of the Mongols.
Letter to Chanchun confirmed how Mongol thinks of themselves: as Chinggis Khan himself was very modest. Khan said he would like to unite the whole world into one empire because Chinese didn't have the constant leadership. Therefore, God has assisted him to acquire China. However, because he didn't have any distinguished qualities nor surrounded by people who were not worthy enough to take high offices, he seeked help of Chanchun.
The Russians thought of the Mongols as savages who killed men and children and raped women. But unfortunately, the time that the Russians described were during the invasion. I believed they were merely describing the war -- but not the typical behaviors of the Mongols.
Chinese were conquered by Mongols and assimilated into Mongol culture. However, the "Epitaph for honorable Menggu" showed what a great leader Menggu - a Mongol governor was. The region that Menggu has prospered under Menggu leadership and the people of the region loved Menggu as he had led them into prosperity while assuring safety of his people.
"Mongol women through the Europeans eyes" was another passage describing what the Europeans would considered primitive nature of the Mongols, although Mongol women were simply preserving their traditions and cultures.
Many different opinions for same culture/race. I think of Mongols as goal-driven, cultural enriched, traditional people. I would love to visit Mongolia one day and see if my perception would remain the same or follow those of the others stated above.