Sadly I think if you haven't liked X, XI, XII, XIII or XIV and don't like the look of XV... I think you have much more reason to feel the way you feel than those who simply dislike FFXIII. Sorry you feel that way, but I guess in your personal case, FF may just not be what it was. Sucks to hear you feel that way, though. I mean, wait, when you say you haven't loved one, have you liked one?
I didn't hate X or XII, but I wasn't really a fan either. I blame X for the shift in linearity, and XII always reminded me of an MMO. Still, they have their strong points.

The XIII saga and The VII Compilation were just bad...