The key word is "fuck-up", if they were at least improving the story in some way or form, I think it would be acceptable. But right now they've screwed a couple of key instances, that when we first read it on the manga we could only explain it with "awesome". Those awesome scenes and moments have now been tarnished by mediocre scenes in this filler arc that could've been easily avoided if the writers would at least have a little bit of understanding to what the fuck they are doing.