well, the FFXIII linearity is really ... very linear
FFX was linear, but at least you were shown on a map where you are and there were towns and stuff .. FFXIII up until now (I'm 35h in) is just a straight path. I came across 1 "city" as well, but that didn't have any other meaning than advancing the main story .. there was nothing else to do there.
and the path itself mostly is a "highway" with monsters on it and stuff at the sides, which you can't interact with, pretty similar to what I played in the folklore demo







