FFI ~ Menu screen would be my least favorite.

FFII ~ Dungeon, largely because I hat the dungeons in this game. It's technically not bad on it's own, but you'll be hearing it a lot...

FFIII ~ Forest of Healing, not a bad track, but it's Uematsu stealing the battle theme from DQ1.

FFIV ~ Honestly, I love the whole soundtrack. But if I had to choose, maybe Tower of Bab-il since you got there twice and it's a long dungeon. Even then, it's not that bad.

FFV ~ Pirates Ahoy, not a terrible track, but not one that really brings to mind pirates when I hear it.

FFVI ~ I honestly love this OST too much to really pick a bad track of the bunch. Maybe Mt. Kolts? But even it is a pretty snazzy track.

FFVII ~ Either Reunion or Fort Condor. Reunion is one of the game big buzzwords and I guess I was expecting something a little more ominous from a track sharing the buzzword. Ft. Condor's is just a bit grating with the weirs Psycho inspired horn section.

FFVIII ~ Blue Fields easily. Worst overworld theme in the series. It's like the game is trying to put you to sleep.

FFIX ~ I will second Karifean on this being Quad Mist, the Tetra Master theme song. It's a bit hokey and boring as well, which make it more infuriating considering the mini-game it's attached to.

FFX ~ Either Battle, the worst battle theme in the series, or Mihen Highroad, the worst area in the game. I may give this to Battle, since unlike the Mihen Highroad, you'll never escape the Battle them until you've finished the game.

Skipping XI.

XII ~ Weirdly enough, Kiss Me Goodbye. It's a fine track, but doesn't really fit with the game very well and feels a bit tacked on like My Hands in FFXIII. Probably doesn't help that it sounds a bit like a break up song, and the game has no real overt romance to speak of. Also doesn't help that unlike the last four vocal tracks for FFs, this one isn't worked into the game's ost, so it really does feel out of touch with the rest of the score.

XIII ~ The Sunleth Waterscape, I can't tell you how much I hate this bad Persona wanting track is. This track is the bane of my existence when it comes to FF games based around music or just ones that use characters throughout the series, because I will have to hear this track because people for whatever reason like it. In fact, I made this thread just so I could rant about this track.

Skipping XIV

XV ~ Nothing stands out as being awful, but probably The Hunters since it sounds like it';s trying too hard to be some badass theme you would hear on some crime detective show in the 2000s to signify the badass character. Like you can't hear this track without a mullet, a six pack, a cigar, and some tragic past that you're no longer allowed to shed tears for because you already shed all the tears you ever will... So yeah, a little too edge-lord for my taste.

Skipping XVI