Even though the season felt kinda stretched, ufotable still made every episode feel like 5 minute episodes. Was a great final episode with a bit to much plot armour (imo) for our favourite smol Nezuko, but I guess they had to introduce her ability in some way.
All in all I would still give it a 7.5/10 because even if the plot is not the best, the music and the animation makes up for it.