There have been worse seasons says little, because the seasons I assume you mean we had much worse squads, not even comparable
This was still prime Barca, given the prime core of Messi, Xavi, Iniesta, Alves, Pique, Alba, etc.
Losing a league for this side from 2008 to 2019 is unacceptable UNLESS you have a wonder-team in a wonder-season.
From all these seasons, only RM 2011-12 under Mourinho and RM 16-17 under Zidane were better than Barca in a single season.
Therefore, that loss in 13/14 is the only one in that decade that shouldn't have happened