If you liked xii then that's okay. It just wasn't for me personally.
I felt like it had pointless characters that didn't have much of a personality and the story wasn't that all exciting; Vayne was a boring villain to add into the mix. Vaan and Penelo felt like tag-alongs instead of being the leading main character and the MC's childhood best friend. It felt really empty compared to the Final Fantasy games before and after it ( xiii)
This add in half the time you actually got side tracked doing sidequests(which were more fun).
Plus the director of this game forgot who it was, or someone with inside knowledge knew Vaan and Penelo were added at the last second. I forget who the real main character was.
Also FFXIII was the opposite extreme it was also empty as well, but in a different way.