The BGM is definitely one of the best i have heard ... it fits in every scene in every episode seamlessly.Also something else I still love about Shinkenger is its BGM. The music for the show has become one of my all time favorites for any Sentai.
With Genta you were encouraged to laugh with him not at him, but not so with Ryuunosuke.
My opinion is probably coloured by the backlash that Ryuunosuke got from some people after episode 46 because he initially wanted to stay with Kaoru
I just answered my own question about Ryuu, but him being in on the 'something being wrong with Takeru' storyline would have been interesting, to say the least.
The fanboy in Ryuu battling with the Samurai part of him to seek the truth and Mako reacting to Ryuu's overreacting would have been awesome. She was the most interesting with her interactions with Ryuu and Tayuu.
The BGM is definitely one of the best i have heard ... it fits in every scene in every episode seamlessly.