Awesome Music: For a series that has weaponized sound and musical instruments, it is to be expected to have a lot. Kagayaki, the 1º opening, takes the cake.
Broken Base: The second half of the series. The general consensus seems to be that those who liked the mold-breaking approach of the first half disliked the second, but those who preferred the franchise's more traditional style prefers the second half over the first.
Epileptic Trees: Shuki, the third female Kamen Rider recognised by canon after Femme and L'arc, and the third to be killed off after an all-too-brief stint.