musashi03
HEROW
The one big failure to me was just Dark Kabuto, which was probably tied to how he was used to fill a story which was mostly created due to problems with Hiyori's actress. Rewatching the episodes with Dark Kabuto, his scenes seem almost entirely disconnected from the rest of the script.
And, unlike the other Riders, he never stands on his own. He does have his own story (experimented by evil organization and using the powers that he received to them to fight against them... sounds familiar) but that gets put aside to focus on filling the hole of Hiyori's absence with pointless Tendo battles.
Wow! I never knew that there was trouble with Yui Satonaka, though I did appreciate how the Dark Kabuto arc started, having a polar-opposite of Tendou (which was pretty much the same with Ryuga, though the other way around) which pretty much made me like Hiro Mizushima's acting. What I didn't like was the way they handled the arc eventually, which led to making Dark Kabuto looking like a kid, which is pretty understandable considering his personality and the way he grew up, but I think it could have been handled better to make Dark Kabuto a more awesome character.