A "D+" passport is a is a poor travel document that provides access mainly to Latin America and South East Asia, and NOT to the Schengen area or most of the developed world. To receive a "D+" grade, a passport must have a Travel Freedom score (Passport Score) between 37 and 50.
Additional Analysis:
The Travel Freedom score of this passport is 20%-50% lower than its simple count of visa-free countries. It means that this passport fails to provide access to the world's most attractive countries.