Oh man, XIII-2 is soooo good. I love it even more than XIII, and that's certainly saying something.
The non-linear nature of the game lets me take it at my own pace while not overwhelming me with a bunch of random missions at once. The music is fantastic (I was initially wary at Naoshi Mizuta being such a prominent composer, as I'm not a fan of his work on XI or 4WoL at all, but damn he knocked it out of the park with XIII-2. I dunno if it was him finally being able to stretch his legs in a bunch of different genres or what, but I want MORE of him.), as well. It's rare that FF does something this different, and I think it's worked out pretty damn well. I’m glad Square Enix decided to try something fresh instead of sticking to XIII’s sound. The vocal tracks, especially the ones sang by Origa, give off some huge Nier vibes to me, which is always great.
The little tweaks to the battle system (instant Paradigm Shifting/monster taming/switching party leaders, etc) make it a lot more enjoyable, as well. All in all, I can see this as being one of my GotYs and more than likely my favorite FF game behind XII. I seriously can't put this damn game down. :|