I have a bad feeling that a war might break out on this thread.
But I'll say Kamen Rider Dragon Knight. Yeah, I know- it's the Wang bros' American take on Ryuki and not a Toei one, or a Japanese show, but I find Kit's character so bloody tedious and dull. The other riders don't help either. I liked Zolda, but his counterpart (Torque) is rather lame. Strike (Ohja) is just a lackey of Xaviax, he's not even his own villain. As for Ryuga (Onyx), I don't want to spoil things, but what they've done to him so far is odd, and not in a good way. It wasn't what I predicted. Also, a lot of fight scenes were recycled from Ryuki anyway. Due to that, you see sudden, unexplained changes of scenery when they "henshin".