I have some weirdly diverging tastes from you all, I think. Wasn't very fond of Ghost, and while I loved the show and I understand the theme, Fourze's design especially with the switches did nothing for me. Even Decade I'm not too fond of (though it may be more because that first Figuarts version was terrible). And Decade's upgraded form... ugh.
I agree that while Gaim's gimmick was weird (shogun and fruit) it worked really well, for almost all the designs. Same with all of Kabuto's riders, I liked all of them.