I'm going to give away (vague) aspects of the show later on, so don't read further if you're at all fearful of spoilers:
Its OK as a show. Its certainly different than the other Rider series. What gets me is that right when its supposed to get good, you know, big bad finally appears, the plot to destroy the world is revealed and the final major epic battle is supposed to occur, Hibiki just fizzles to a quiet death.
I mean, its that bad; no final boss,no big reveal, no final battle. My advice, don't bother, its a good ride once you get used to it, but its a good ride to a very big disappointment.
Reading toku blogs and forums reveals why it ended the way it did, but that doesn't make the (lack of an) ending any more bearable.