Watching movesets of "Ultimate Forms" of main riders on the videos, Im gonna say they are too simplistic.
Ultimate Kuuga has: fire punch, fire kick, aerial fire kick (those share animations with a bunch of characters) which is kind of letdown. His distant pyrokinesis being used only in cutscene finisher (because Ultimate Rider Kick was not enough to finish opponent off, lol).
Chou Climax has, well, only sword slashes (and is able to fly, again only in cutscene);
Shining Agito again only has sword slashes
CJX has fast sword projectile, slow shield beam, air rider kick, Faiz Blaster too has fast projectile, slow beam, air flight slash; etc in the end theres alot of repeats and not much variety. I would rather see some unique moves. Moveset of G3-X looks more innovative than some of Ultimate forms, honestly.