See I have almost the opposite dilemma - I didn't finish FFIII-2 before I started playing Reckoning and now I feel like going back to finish it up. I wish I was at home where I have a dual-screen gaming setup where I could do both at once! (It's not like FF combat takes much effort to grind through)
Playing FFXIII-2 after Amalur is like paying someone to intentionally stab me repeatedly with a tuberculosis tainted rusty nail