Worst boss fights

[Synaesthesia]

Fights with gear syncs so high that tank busters feel like auto attacks and mechanics don't even matter, it's really hard to say which one is worst. The game has tons of those.. I understand that having a sync above minimum is good so you can feel your character's power as you get better gear, but there are countless encounters where it's so lax that the content isn't even enjoyable anymore.

[StriderShinryu]

That dumb slime from Copperbell. You just sit there until you can blow it up (with the super slow spawning bombs) into small enough chunks to kill it. ZzzZZzZzZzzZz...

All of the bosses in Copperbell are pretty terrible. The worst part of them, though, is that they are actually all potentially interesting. There's an interesting idea in there for each of them that could/would actually make them better than the vast majority of cookie cutter bosses in the rest of the game but not because they're stuck in ancient, low level content.

[SpeckledBurd]

Every single boss in Neverreap.

[Morningstar1337]

I'd say Ifrit, Garuda nd Titan NM, not for the mechancis but because getting them in Leveling roulettes sucks for people trying to level alts. Its a waste of the exp bonus IMO.

I also think Ultima Ultimate was a missed oppotunity for not including Leviathan, Shiva and Ramuh, but I haven't touched that fightand likleynever will.

For actually bad bosses? Well when you can and had been cheesed by waiting for the enrange and then then just spamming heals, you're now exactly the mos the challenging of bosses Allagan Rave Node. On the other end of the spectrum we have Titan in general prior to certain nerfs.

Almost forgot. Deathgaze Hollow is almost bad as Titan with his Void Death sucking you in twice to endure you die unless your hardware is up to snuff.

[KageTokage]

Fights with gear syncs so high that tank busters feel like auto attacks and mechanics don't even matter, it's really hard to say which one is worst. The game has tons of those.. I understand that having a sync above minimum is good so you can feel your character's power as you get better gear, but there are countless encounters where it's so lax that the content isn't even enjoyable anymore.

I've never really understood why they made the item sync for the final fights so insanely high that the bosses end up dying faster then the trials preceding them.

It makes for a rather underwhelming finale if you don't get them done close to the expansion's release before people outgear them horribly.

[Gula]

Dusk/Stone? Vigil (Hard) with the Temple Knights against the armored dragon.
Ran'jhit
Bardam's Simon Says because while I thought the Indiana Jones moments were cool, that one very much was not.

[Morningstar1337]

I've never really understood why they made the item sync for the final fights so insanely high that the bosses end up dying faster then the trials preceding them.

It makes for a rather underwhelming finale if you don't get them done close to the expansion's release before people outgear them horribly.

I'm not sure either, Other than for convenience or lack of regard when they made the max ilevel equal to that of the stronger gear in all relevant instances. Though SE at least learned to tune the mechanics to take that into account (no amount of gear will save youif you failed mechanics at Dun Scath and Orbonne)

MSQ's roulette's a lost cause though,unless they want to make ARF, Ala Mhigo and Aumarot 8 mans

[Enkidoh]

Anything with stupid Quicktime Events where it's basically "mash X as fast as possible to not wipe". If it was just a single player game it would be no problem, but when you throw in the uncertainty of internet connections and lag... a battle that until then was going fine... could go pear shaped simply because the game didn't register the button presses fast enough (and of course that is me most of the time). And unfortunately SE seems to be throwing it into boss fights more and more now, although luckily ShB it was far less used than SB was. Lakshmi, Susano, Shinryu... even Hades.... were all let down due to having QTEs. Quicktime Events are the bane of gaming.

Non QTE releated - Titan in any form is probably the worst though due to those damn landslides and being knocked off the edge... urrghhh... who thought that was going to be a good idea?

[Stepjam]

I like middy savage in theory. But fuck does it suck as a tank, the random mandatory tank swaps are the worst, especially with his super strong tank buster. If you get the first tankbuster then get forced to be tanking for the second one, it's the worst.

Otherwise cuff of the father normal is easily my least favorite fight in the game. It's so dull, it's just a giant add pull with some bomb pulling.

[Vyrerus]

Gordias Savage - Arm of The Father - Living Liquid. Thing broke my static within one month, and then we had to reform the group with new people about every month after that until we finally beat it 5.5 months after it came out. It made me never want to tackle another fight for that long ever again, so when Ultimates came out and people say, "Oh common learning time is like 4 months of 12 hour prog every week." I went with the hard pass.

Guildhest - Annoy the Void - and then any of the ones similar to it where you have to kill a boss. The guildhests are supposed to be teaching you to respect add phases and mechanics, but the mechanics are so loose in there, even before all these wild super potencies we have on weaponskills and spells these days, that you never ever had to respect them or learn at all. This sort of design choice echoed on into almost all other content where mechanics are often times kept so loose that people actively look for ways to ignore them so that the boss remains as training dummy as possible. God forbid you interact with it a little more than just hitting it as hard and fast as possible.

Any fight that they nerfed - Yeah, kind of a cop out answer, but a lot of great fights were made into pushovers like this and absolutely ruined because of it. Steps of Faith originally had enough HP with dangerous enough adds that it actually consistently would get to the 3rd Dragon Killer even with doing everything well coordinated. Having to shoot it in the chest with both of the bridge binding chains to keep it rooted so that a third party member could drop the dragonkiller on it without wiping the party was pretty dang cool. Add management mattered, and things really felt dire. I really liked that Vishap was so big and powerful that it could ignore you, as its only goal was to take down Ishgard's barriers. Being stepped on originally dealt like 4500~5000 damage, and was pretty much death for healer/DPS.
Siren in Pharos Sirius having to be Silenced or Stunned when it did Lunatic Voice to prevent the originally unremovable healing effect received down debuff while also flinging the charm on people where if they weren't full healed, they started attacking each other. To top it off, the adds spawned and more adds spawned, the crawling types could seize and immobilize your tank and healer completely. Quite a rough fight originally, especially if you had no BRD or PLD once she went stun immune.
Sunken Temple of Qarns laser telegraphs, final sting, and Qarn Facer spawns...