Half the game had bouncy upbeat pop songs with cheesy lyrics on a permanent loop while you were exploring the game's mostly barren levels and doing basic fetch quests, making you feel like you were trapped in a 12-year-old girl's iPod
It would've been a perfect thematic fit for FFX-2 where you were playing as a girl idol group but in FFXIII-2 it was just one of the many puzzling things about that trilogy 
spoiler
Yes I have had the OST on my phone since 2011
I know most FF games only by their soundtrack because of theatrhythm so I have no idea what the 13s are like. Still, I'm totally confident that the game can't be bad if it has Crazy Chocobo in it.
The music was the one consistently nice thing about the series, even if XIII-2's soundtrack choices were a bit puzzling. The story and characters were just straight up bad and they retconned the universe's cosmology in every entry. Gameplay was a hot mess too but by the third game they hit a stage where it mostly felt like a real game