Other than 9 seasons of his career you mean?
France aside, not winning league in Spain for two seasons against Atleti, not winning with Chelsea in two seasons as well when the competition there was not great, and losing one league title to mighty Xavi
are all telling
You have to see the whole picture, and the whole picture says Ancelotti does not like leagues that much.
Can't be compared to serial winners like Pep or SAF
Yes, he did with PSG
But we can't judge if it's systematic as we haven't seen him with top teams able to cling the title for years in other leagues,
Systematic? Well, its systematic for PSG to cruise to league titles, except that time Poch was there.