Hmm

IV - The last dungeon was horrendous
V - Umm the ship graveyard probably
VII - Midgar
VIII - The space thing. RINNNOOOOAAAAAA
IX - Gargan Roo
X - Bikanel Desert when you're looking for everyone. Once you find Home I like it a lot, but before then is no. Also the mandatory Blitzball match, I dread that everytime
XII - The sandsea
XIII - Barthandewhosit fights

The others didn't have anything that stood out enough to me