If anything, the lukewarm response of the last X-Men movie, X-Men: Apocalypse might have more to do with Logan projecting a domestic opening smaller that X-Men: Origins.
Still, this shows just how important the rest of the world is becoming when you look at the box office.
Deadpool previously proved that an R-rating attached to a superhero movie is no real barrier to box office success.
An opening around $170 million certainly shows that to be the case here as well.