Now at first sight that's a subjective question. But I'll explain now that it's not. So please don't answer subjectively either!
Pamir Highway between Dushanbe and Khorog, Tajikistan
When papers or publications release pieces about "the richest country" it's usually based on something - maybe GDP, or debt, for example.
Hitch Wiki gives each country a 'hitchability' rating, for example. But that's only one form of travel, and there's not much granularity in the rating system.
generic hitching picture
Is there a publication or source that through some moderately scientific calculation, publishes a list of the hardest (or easiest) countries to travel through?
Yungas Road or "Death Road" in Bolivia
I'm not sure myself how you would measure this - but similarly, I'm not sure how you'd compare crime stats between countries. Yet news outlets, universities etc have found a way, with many studies. I'm expecting someone's come up with a 'scientific' way to do it, and I'm looking for that.