I honestly didn't think all of the new FFs were "terrible". Sure they're a bit different from the classic ones, but Square remakes the classic ones enough that if you want more typical JRPG fare, it's available.
XII had a drastically different combat system, but I enjoyed gambits and all that jazz. I just think it is a pity that they made Vaan the main focus (Apparently Basch was supposed to be the main character, but midway through they decided he didn't appeal enough to their demographic).
XIII I didn't particularly like, but it had incredible production values, and the battle system wasn't flawed, I just didn't care for it. It was a little too linear in both exploration and character customization for me.
My personal order is probably something like: V, VIII, VI, IV, VII, IX, X, XII, III, and the rest vaguely tied for last.