Everyone talks about how much they liked the suit designs in this show but the truth is they all sucked. They were busy and bulky in the default forms and just got worse from there. Also the belts talked way too much and made every group transformation sequence (of which there were tons) a pain to listen to. The Ganmeiser enemy designs were garbage too. I actually really liked all of the out of suit character designs though.
I also liked the secondary cast a lot, perhaps the best I have seen since OOO (which, given that I skipped Gaim and Drive is not saying much.) I thought the middle part of the show, with them first invading the Ganma world was exciting, and both Makoto's and Alain's initial arcs were good. Then the show did nothing for twenty episodes while the Ganmeiser shit played out. I'm also disappointed that Ghost abandoned most of its more high concept stuff (invisible fights, the Ganma world being tough to live in, the Ganma as anything more than a group of like five people, etc.) Course Toei's shows seem to have a history of doing this stuff recently and I bet its going to happen again in Ex-Aid.