It's not that it's a big deal, it's that these rankings are pointless because they say that US citizens can go to the UK visa free but not Vietnam when in practice the requirement to enter both countries is exactly the same (go on a website, fill out a form, and pay $20ish).
Yah, I'm not disagreeing. US passport is still very good, if only because of easy access to US embassies abroad in case of trouble. I don't mind a little paperwork to travel to other countries
