[Lord Benendearu]

My least favorite sentai show is, as many people before me said, also Goseiger.
The biggest problems I had with the show were mainly the story and its pacing. For me, it felt the series was just repeating the same pattern several times over, before making its big reveal with a certain character.

While such pacing can be excused with having an interesting cast of characters, making it a character driven series, Goseiger unfortunately also lacks that, in my opinion.
The ranger characters felt very inconsistent to me. For example: in the second episode, Hyde saves the day by showing effective leadership through logic. In another episode, where each of the Goseigers gets a turn in leadership, Hyde fails when he tries to open a vault by attempting every combination there is. The series was never consistent if he was an effective logic thinker, or unable to think outside the box, making him ineffective in situations where that is required.
I felt this inconsistency with almost all of the ranger characters.

It is not so bad that I regret watching it, as it has some good elements, such as one of the villains and the finale. But it is simply the least favorite of Sentai shows I have seen.