Ok I have few:

1. Final Fantasy 8- D-Distric Prison~ Despised this part soo much!! I become soo angry and annoyed at this part that I cry lol ( I know imma baby )
2. Final Fantasy 13-Orphan's Cradle~ Ok I just now made it past this part and omg I couldn't stand it.The fiends or whatever are just soo dang hard!! Geez the 3 main bosses in this area were easier than the frekin fiends >
3.Final Fantasy 9- The Card Duel Tournament~ OMG!! I hate this frekin part.I can never beat the people. Thank goodness for luck!
4. Final Fantasy 10-Blitzball tournament~ The only part I hated about this game.Ugh I never win and I hate playin blitzball ( no offence to anyone,especially Ethan lol )