Few things I hated

Corridors as far as the eye can see
Can only move so many places on the cystarium grid before the game lets you level up anything else
Side missions, you get to fight things, which is what you've been doing the entire game already
Vanille, be quiet, please
Look at this big open field it took you 20 hours to get to, now run around for an hour and get bored because there's nothing to actually do in it.
Auto battle, you don't have to use it, but it's there.
(SPOILER)
^
Don't want to get lost now.
Fill the stagger bar to win

Game was just bad, XIII-2 was alright but I never finished it, got bored, am going to get LR, might be better.
The recent PC release had dual audio which made Vanille likable, that's one good thing out of like 8 bad things I didn't like, there's no saving XIII.