Hmm...

In VII for me getting out of Midgar. Sucks that its the very beginning of the game, I'll probably never play it again because I hate that part so much.

In VIII was when you got to Timber. FML I hated that area too!

IX - Conde Petie (or however its spelled) annoyed me too. I didn't like the way the characters spoke, having to advance the story line bugged me too. Especially because I loved the Black Mage Village so the sooner I was out of Conde Petie the closer I was to the Mage Village.

X - Anything to do with Blitzball, That forest that I can't remember the name of and the part right before you get Rikku irritated me. LOVED all the Cloister Trials though!

Can't remember anything with XII off hand

XIII - Yup, Fifth Ark was tedious. I did like the game but I liked it SO much better after I got to Gran Pulse.