User blog comment:Hollow Mario/Worst Filler and Original arc/@comment-18753817-20150110205817

Worst Filler Arc: I would say Invasion Arc but I haven't seen enough of it to form an opinion on it, so instead I'm going with "Zanpakuto Unknown Tales Arc". For several reasons such as awful character designs and Tenken throwing fire balls despite being a melee type.

Worst Story Arc: The Lost Substitute Shingami Arc, it wasn't really that bad it was just bland. The Fullbringer just aren't that interesting.