Started thinking on this subject after coming across one of the ubiquitous lists: http://www.marketwatch.com/story/which-passports-are-the-best-and-worst-to-have-2015-04-16 This particular one was put together by a company selling various "passport for investment" schemes. Not surprisingly USA (along with UK) is their #1 seller. But their only metric was the number of countries willing to admit a passport holder. I could add several other metrics to consider: * Support of your home country in case of emergency or war. * A long and growing list of reciprocal fees. * Responsibilities of citizenship (taxes, mandatory paperwork and reporting, military service). * Benefits of citizenship (services, healthcare, safety net). The last two are not really travel-related, but come with the passport anyways. So what are the biased opinions of this community?