I thought Daishocker was one of the better ideas to come out of the show, though the fact that they weren't willing to give it the attention it needed didn't help. Had they gone about it from the get-go, with subtle hints that all the Heisei villains were secretly being united, it could have been reaaaaally good. We'd get freaky little things like the villains knowing of Riders they shouldn't. Why do guys in Blade World know about Kuuga? We'd have some Orphenochs or Worms experimenting with cybernetic augmentation and weirdo hybrid monsters. Creepy little hints here and there, building up to the big revelation that the classic villains are back. I think it would have made for a pretty awesome twist. Decade unites the Riders, Daishocker unites the villains.
As it is it's good fun, but comes in too late. Decade only has a proper reoccurring villain for the last few episodes. Narutaki's pretty much beyond help after Hibiki World, where him riding on a giant crab bitching about Decade killed any threat credibility the character had with me. He just became a joke. They could have at least done something with various big name villains running around for a few episodes and being defeated, dropping hints as to who Tsukasa is. Birugenia, Peacock Undead, General Shadow, and of course Apollo Geist...
If I were doing it, I'd have the first half of Decade concentrating on the 9 Heisei Riders and the Rider War coming in the middle, just sticking to them like in the first episode. Decade gets access to Complete Form when he has the accumulated power of the 9 other Riders, Narutaki is explained and settled, and Decade unites the main Riders and ends the whole war thing, which is all part of a bigger scheme. Daishocker's manipulating things even when they aren't onscreen.
The rest of the show is traveling around the Showa Rider worlds, meeting more Riders, with Daishocker gathering the remains of the Heisei villains (who have largely been destroyed in the first half) in preparation for something big. We find out where Decade originally came from, and it all culminates in the All Riders-type team-up finale.
But oh well, not much point in saying what I'd do, because it's already been done. :laugh: