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How is that more meaningful, unless you value every square kilometer of Siberia, for instance?

Or you could argue that having access to all of the seas without a passport means that the per-km2 value of a passport is actually relatively small? :)

Suppose your passport only granted you access to 4 countries.

Mine gets me to Russia, Canada, the U.S. and China.

Yours gets you to Grenada, Malta, Maldives and Saint Kitts and Nevis (ignoring the EU for a moment).

Which one is "more powerful"? Obviously mine is since I get to enjoy most of the landmass of the Northern Hemisphere while yours gets you access to a handful of minor island nations.

GDP would be a good measure.

from another post in this thread: http://www.doyouneedvisa.com/rank/passport/

lists both land area and population rankings, also inverse rankings based on who can enter the country: http://www.doyouneedvisa.com/rank/border/

Maybe the power rank should be self-referencial. More higher power-rank country you can visit higher your power-rank.