Of Nobuo's work, I would honestly say X and XI are his weakest works personally. Course he didn't do all of the pieces for either OST and in the case of FFX, I prefer his stuff over the other composers but they're still the weakest for me. VIII's OST is like Chrono Cross and FFXIII's OST for me. Great when you listen to them by themselves but they often suck as soundtracks because it's difficult to remember when any of them play beyond major themes that get overplayed or irritating tracks. It just doesn't work as a soundtrack to me but musically I find the album is not so bad.