I disagree that it's easier than the NYC subway. The 'zone' system is complicated for tourists who aren't used to dealing with that. Contrast to NYC subway where it's $2.90 (formerly $2.75) to walk thru the turnstile and go anywhere. It seems like Paris is adopting a similar model which is nice to see. NYC also has nearly 170 more stations than Paris.

What is hard to use about it ? The machine or the teller will give you the proper ticket. Plan highlighting the zone are in every stations and cars. ( on top of the doors )

Not living there anymore but I think those zone are on the way out anyway. They make it more expensive for folks with less income.

I was actually comparing both through the viewpoint of a tourist.

Paris was far and away easier to navigate, even though I don't even speak French.

Get the NFC card and you can refill it on your phone. Super easy to use.