Hibiki rivals Agito in character development, depth, and execution. Granted, it was a bit removed from the "Kamen Rider" tradition, but it totally made up for that with its meshing of traditional elements (as in culture) and the newer tokusatsu. The riders aren't just pretty boys (granted many of them are very pretty) getting nice weaponry without lifting an anorexic finger for it. They train to earn their places, they have hierarchy and order, the Takeshi Group is shown to be an intrinsic, but unseen part of maintaining the order between that proverbial "Good" and "Bad." Heck, they even mix the lines between those distinctions seeing as they get their "powers" from Oni. Hibiki took what's perceived as the richest and best portions of Japanese Culture and meshed it with a modern and fresh approach of tokusatsu.
Judging Hibiki within less than the first 10-15 eps is not giving it due justice. Like a J, K, C drama - it builds its storylines, they crescendo. You can't tell me that Zanki's personal dilemma with his teacher, and Todoroki's personal challenges, or Akira's misguided ambitions are not chockful of character.
Interactions between Asumu and Hitomi, the Takeshi girls and riders...that's what makes Hibiki good and stand out.
Bottom line: if you're willing to step out of the traditional, but rather static framework of Kamen Rider-ness and see the ways Hibiki takes that and modifies it, along with all the essential elements of cosntructing a compelling storyline, with kickass music, then Hibiki does that. If you'd prefer the shoddy and rather shallow storylines of particularly the Heisei Generation (excluding Agito and couple others) , but very gimmick-heavy Rider shows, you'll probably not enjoy Hibiki too much.