These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Baten Kaitos
Angst? What Angst?: Sagi, from Origins. In stark contrast to Kalas, Sagi is upbeat and cheerful through most of the game, although he does have a few moments.
Anti-Climax Boss: The Post Final Boss of Eternal Wings; despite having a mountain of HP, he has weaker attacks than most regular enemies and no defensive capacities whatsoever. And if you know the One-Hit Kill trick (use a Spirit Attack magnus), well!
Quaestor Verus, despite being a tricky Puzzle Boss, goes down in a few good hits once you expose his weakness. His death is somewhat anticlimactic too unless you jumped through a few hoops in the story...
Wiseman from the second game is a raging psychopath, with a purely sadistic edge and a Lack of Empathy for all living beings. Wiseman, a millennium before the series began, began to believe existence of the body was flawed. He fell to evil and began devouring the energy of his followers before embarking on a war of conquest that look the lives of men, women and children. To spite a group of heroes who stood against him, Wiseman killed near everyone in their hometown, and left only two survivors. He attempted to convert the world to energy and absorb it within himself. Despite failing, Wiseman was not destroyed and possessed Verus and corrupted him. Wiseman manipulates all of Verus's atrocities, causing mass death and even torture of his former lover. When forced to reveal himself, Wiseman declares his intents to devour the heroes' hearts and rule over their world for eternity.
Baten Kaitos Origins has Quaestor Verus, who, while acting under the guise of a Reasonable Authority Figure, coldly masterminds the plot to become the Emperor by taking advantage of everyone else. Before the game's events, he uses a just born baby Sagi (whom he may have fathered through rape) in a lethal experiment that fuses pieces of dead evil gods with living beings. During the game, he orders Shanath (a massiveJerk Ass in his own right) to cross the Moral Event Horizon by taking Sagi's mother Gena's wings off in the public election speech...just to smear on the reputation of someone getting in his way. Later on, just as Baelheit is about to consider a Heel-Face Turn, Quaestor Verus shows up, murders him, and starts gloating about all his deeds.
Demonic Spiders: There's a bunch in Origins, but Machina Auto-Turrets take the cake. Fast, resilient, powerful, and that Fusillade special is devastating. Enjoy losing over an hour's progress through Tarazed every time you run into one of these.
Ending Fatigue: Eternal Wings. There's several places where it feels like the story is wrapping up (the Lava Caves, the Imperial Fortress, Algorab Village), but there's always something more. Granted, the game does manage to pull everything together beautifully, but 60+ hours is an extremely long time.
Even Better Sequel: Origins expanded on the backstory of Eternal Wings, explored the setting much more, revamped the battle system to remove the more frustrating luck elements, had better voice acting, and had an even better soundtrack.
Fanon: The idea that Sagi and Milly are Melodia's parents seems to be agreed upon by most of the fanbase. The implications are there, but it's never stated outright.
Giacomo: Just when I thought my career was finished, I look over at the stairs aha ha ha, and it's YOU! Guillo: Are you obsessed? A koa monkey in heat wouldn't be this clingy.
Fridge Brilliance: Lyude's voice acting is noticeably even more wooden than the rest of the first game's cast. This actually makes sense when it is revealed he is 1. Homeschooled 2. did not socialize with his siblings or peers.
Why the whole Guardian Spirit thing when in the first game it never really comes into play plot-wise? So that the point of view of the narrative isn't on Kalas, thus better hiding that he was Evil All Along.
Game Breaker: The Apotheosis and Frigid Queen's Festival combos in Origins border on this. Their incredible damage is offset by the difficulty of effectively assembling the combos without getting the party wiped, as it usually means a few turns either discarding useless cards or attacking sparsely to build up MP.
Wonder Momo Magnus in Eternal Wings. Second-best healing in the entire game, 100% cure on every status (including death) in offense, 100% resistance boost to every status in defense. Best of all, unlike Deluxe Sushi and many other recovery Magnus, it never wastes away, eliminating the need to go make more. Even better, you can get these as soon as you hit Anuenue, since they evolve from the Momotaro Magnus, which evolves form the relatively commonly dropped Peach Magnus in the Ancient Library. Get a handful, leave your game turned on overnight for a few days, and barring a stroke of the worst luck possible, you'll have to actively try to lose. Hell, just having one or two on each character makes even the otherwise really tough Final Boss a joke.
Goddamned Boss: Wiseman, who steals your HP and MP with his basic attacks and uses it to spam his specials, one of which breaks any Magnus you have equipped and knocks the whole party down.
The Gnosis you fight in the Outer Dimension in Eternal Wings. It has -100% to Darkness and -50% to everything else; despite not having much in the way of offense, its defense means the fight takes forever.
If Verus didn't cross it by killing Baelheit, he sure as hell does so when he retroactively claims responsibility for the above-mentioned event. And reveals he was behind Sagi being a part of the malideiter project. And to cap it off, calls Gena a whore. Oh no you didn't.
Everything about Wiseman, especially his battle theme, if you can even call that music.
The Phantom Goldoba, which was brought into existence by an interdimensional mind parasite that feeds upon anguish and suffering.
Verus-Wiseman. A hideous, almost undescribable Eldritch Abomination, with attacks like 'Cast Away Your Carnal Robes' and 'Magnus of Life'. And you fight him in a starscape. Take from that what you will...
After a game spent almost entirely in fantasy landscapes and cities, walking into a city that wouldn't be out of place in Mass Effect is extremely jarring. Just to add to that, talk to some of the citizens there.
After The Reveal, Verus becomes an extremely scary person. With that Nightmare Face portrait, the things he talks about, and his general plans...
Geldoblame's Start of Darkness at the end of Origins is so different from his previous personality that it's genuinely frightening.
Admit it. If Guillo wasn't on your side, that thing would be an incredibly scary adversary.
The Scrappy: Wacho and Tik, two annoying kids that force you through a dull sidequest early on.
There are many people who outright hate Xelha for stealing the spotlight for a sizeable chunk of the game, being a borderline Mary Sue, having one of the game's most grating voices (and more lines than anyone else), geting hit with a Distress Ball, and wearing an eye-searing pink outfit. Oh, and also her half-assed Disney Death scene.
Scrappy Mechanic: Eternal Wings and the Item Crafting system, which was time-consuming, irritatingly luck-based, and never explained very well in-game.
Eternal Wings also had an irritating level up system, requiring you to visit a blue flower and talk to a priest to gain your hard-earned levels.
Which can also render the game Unwinnable at one point if you're underleveled enough, thanks to the game trapping you on an airship with a red flower (which only lets you save) and one of the hardest boss fights in the game.
So Bad, It's Good: Eternal Wings' cutscenes, with the terrible voice acting and stiff character models, tended to be quite amusing.
Verus-Wiseman's Magnus of Life, which hits the whole party and inflicts all status ailments.
The Angel of Darkness' Binding Winds, which is practicaly guaranteed to paralyze you. Worse, he'll immediately follow this up with a combo ending with Fangs of Darkness, which the paralyzed party member will be completely unable to defend against.
Agyo's Seal of Agyo, which is a single attack that deals a ludicrous amount of damage. There's no way to tell if he's going to use this or a combo, so it's basically impossible to effectively defend against.
Fadroh's Orb of Magical Offense. It turns a rather tame fight into a Curb-Stomp Battle...in which you are in the receiving end of. Worse, it's use is completely random. It's a Luck-Based Mission: Either he doesn't use it and you kick his ass, or he uses it and obliterates yours. If he uses it early on in the fight, you might as well restart.
His counterpart, Sowzana, has the Orb of Magical Defense. The thing is that this one gives him a milder power boost...in exchange for ludicrous defensive power, turning this into a Damage-Sponge Boss that hits rather hard. The fight comes down to who can eat the most damage before keeling over. He also seems to always use it, so it's basically coming down to how soon he gets it.
Malpercio's skills. Dark Arrow inflicts all status effects, Enchanted Blade is a Life Drain that heals back a lot, which he'll later use on the entire party in sequence to heal a ton of damage, and finally, Seal of Entropy, which defines this fight as a Barrier Change Boss, meaning you're forced to include every element into the fight in order to optimize you damage output or chip away at him until he decides to use Seal of Entropy again, hopefully to an element you can exploit.
The Black Dragon's Crimson Catharsis, which will almost always kill one or two of your characters. If you're underleveled, weakened or particularly unlucky, it may even cause a Total Party Kill. By the time you can have a rematch with it in the Coliseum, you can kick it's ass fairly quickly, but this attack will still deal a lot of damage.
Giacomo, Ayme, and Folon, which is a fight that seems to be designed to screw the player over as much as possible, not least because they're fought shortly after you lose access to a blue flower. How do you access a blue flower to level up? Beat them and move on to the next area.
Geldoblame, who heals himself nearly every round and combines paralysis (removing defensive ability) with a One-Hit Kill attack (which seldom hits unless you're paralyzed).
The Angel of Darkness, who combines a paralysis attack with one that steals HP.
The Holoholobird, a hard-hitting Flunky Boss whose flunkies love to heal the big bird for tremendous amounts of HP. It's also fought immediately after a Point of No Return, which can screw you over big time.
The Godcraft, who is tremendously overpowered and has devastating specials that can destroy your whole party if you're unlucky. Doesn't help that the cutscene beforehand is about five minutes long, so if you Rage Quit (which you will), you have to sit through it all again.
The Black Dragon, who has so much power it can kill your characters simply by using a full combo on them. Not to mention its special attack, which can damn near cause a Total Party Kill if you're unlucky.
That One Level: The Tower of Zosma in the first game, Tarazed in the second. Zosma Tower had irritating block puzzles that had to be completed in a certain amount of time, Tarazed featured mazes of identical corridors and four aggravating puzzle/maze rooms.
Not too many people are fond of Nekkar, which teems with Queen Alraunes, is covered in irritating pit traps, and has a maddening sidequest involving pushing humanoid rocks through the level.
That One Sidequest: The Pac-Man sidequest in Origins, which takes an utterly insane amount of time to complete. It seriously takes longer to complete this one sidequest than it does to do everything else in the entire game combined.
Requires a minimum of two playthroughs to do. Also, have fun spotting every single potential Lost Forever quest magnus, cause you need to feed Pac-Man 147 to finish the sidequest.
As if Zosma Tower wasn't bad enough, Mizuti's sidequest reveals it's got a basement. Five more floors of sheer pain, and a luck based boss fight at the end.
Too Cool to Live: Sir Rambari, the badass leader of the Diadem Knights who takes a sword to the chest to save King Ladekhan.
Uncanny Valley: The shopkeepers, all of whom have one facial expression that they always maintain. It's much creepier than it sounds. Also, in Origins, some of them have badly-implemented Jiggle Physics, which leads to big Fetish Retardant.
The character models in Eternal Wings, all of which move like puppets with the strings cut off. Origins made them quite a bit more fluid, although they're still a bit off.
The creepy CGI opening to Eternal Wings.
All in all, however, the game mostly averts this; cutscenes take place with the same camera angles as normal gameplay, so you seldom get close looks at their faces - it's the same thing Chrono Cross did, just with voice acting.
What an Idiot: Ladekahn, who believed The Empire, which had just attempted to besiege his nation based on flimsy, baseless claims, would honor their ceasefire agreement.
The whole game, really. The world once was whole, with gods ruling the land and the Whale ruling the ocean. However, an evil god rebelled against the other gods, massacred them, and swallowed the ocean, killing the great Whale. The men killed the evil god, but the blood of the dead gods tainted the world beyond recovery, so the men used the body parts of the dead god to send continents into the sky. The design team was definitely on something.
Of course, as Origins revealed, this opening myth is truth, but certain crucial parts were lost to time. Specifically, the "evil god" wasn't neither evil nor a god, but a group of five human friends who had great power and through circumstance made a Deal with the Devil to stop the truly evil Wiseman, the "gods" were all brainwashed humans who served Wiseman, and the "men" were the Children of the Earth, who stepped in to stop the war.