A lot of reviews seem to say that the story isn't that great.
It's probobably just things outside the core game that hamper the experience a little, but at the end of the day, it's a review score.
I don't doubt that I am gonna sink in a lot of hours into X.
"Just for comparison Uncharted 4 was 20x bigger than Splatoon 2. This shows the huge difference between Sony's first-party games and Nintendo's first-party games."