The singing ruins an otherwise decent belt. Why does every show now have to feature some kind of eccentricity? It would actually be cooler if the belt didn't speak at all. It seems that the more bells and whistles the belts get, the sillier they appear in the end. Which is a better image, Godai or Shouichi transforming, or Eiji with Akira Kushida's "Tatoba Tatoba Tatoba!" melody?
As for the OP, the "rapping" is terrible, but the rest of the song is more or less acceptable. It'd be better as an insert song instead of an OP. I'd like to see more OPs that are a bit less upbeat and more sober, like Kuuga, Agito, Ryuki and Decade. From Den-O onward (sans Decade) the OPs have all had a fairly similar tone.