A "B" passport is a very good travel document that provides access to many attractive countries. To receive a "B" grade, a passport must have a Travel Freedom score (Passport Score) between 120 and 140 and provide mandatory access to the Schengen Area.
Additional Analysis:
The Travel Freedom score of this passport is at least 20% higher than its simple count of visa-free countries. It means that this passport may not provide access to a large number of countries, but it provides access to very attractive countries.