XIII's save points just felt friggin' weird. Looked out of place, and didn't really make a whole hell of a lot of sense in the world presentation. I'll grant you, VII and VIII's didn't either when you really stop to think about it, but after IX and X's clever integration, they needed to at least feel like they belonged there.
XII's were still kind of weird, but at least they kind of fit the aesthetic of the random crystals in that world; and Crisis Core could have gotten away with damn near anything since it was a PSP game, but they at least put the SOLDIER logo on it (North American version anyway), so we could maybe think of it as Zack reporting in or something.
XIII's are just ugly, as random as Dirge of Cerberus's jukeboxes, and honestly scared the shit out of me the first time I saw one unfold. My reception to them wasn't helped by the realization that they were supposed to pass for shops in what was ostensibly the first "next gen" FF.