I quite liked the locale in FC5, but the (nearly?) unavoidable captures the game would force on you when you did too much open world stuff annoyed the hell out of me.
Then I had the ending spoiled for me and I just got too annoyed at the story planners and never touched it again.
What you see in stuff like Google Maps or OpenStreetMap isn’t plain Mercator, it’s a variant called “Web Mercator”
And the US DoD doesn’t like it because it introduces even more deviations than plain Mercator.