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.
Broken Base: Some fans complain that this game's action-RPG battle system is far inferior to those used in the previous two. It's a reasonable complaint, since it is less advanced than those of other games like Kingdom Hearts 2. The battle system is rather bare-bones as well, barring the reyvateil mechanic...really, there are a heck of a lot of ways they could've made the battle system better.
Dude, Not Funny!: Does Gust really expect us to think that turning people into a cake is funny? I mean it's turning freaking people into cakes! A living being! How can we laugh at that? Because that's precisely the idea why they put that in the game.
Ensemble Darkhorse: East or West, every Ar Tonelico 3 player's complaint for this game is likely to be "Why won't Akane join us?!" She's a gorgeous Lady of War,Finnel's best friend, and regularly travels with the group in Phase IV. The answer is likely the additional resources to make the FMV for her special attack, making the purged model, making additional party topics, and drawing up the artwork for new weapons and armors. The same applies for any other character that could have joined.
Then, of course, there's Cocona, who was guaranteed a role in this game due to her dark horse status in AT 2.
Informed Wrongness: Apparently, Shurelia has done something that makes Tyria hates her, but they never shows it and Shurelia is just mentioned in 2 lines in this game, Sequel Hook perhaps?
It's because she envied the kind of father Shurelia had: Eleno (Shurelia's adoptive father) treated her with love and kindness, while Kurogane (Tyria's adoptive father and creator) treated her as a guinea pig and forced her to undergo cruel and horrible experiments to bring about her true potential.
Magnificent Bastard: Akane, she purposely let Archia hack Clustenia's database to lead them to the wrong place; later she takes this chance to catch our heroes and the said Archia's second in command, and proceeds to invade Archia while they're unaware. She's a great example of an intelligent antagonist; Ensemble Darkhorse indeed!
XaaaCi...or a Tear Jerker, if you read the last few lyric lines and what the song is supposed to represent: Gaia's Vengeance at its finest. Few things are so tear-inducing as getting told by the Planet itself how much damage you have done to it, and if you still remember the days in which she it gave you so much.
Nightmare Fuel Station Attendant: Saki, what is more unintentionally horrifying: the fact that Saki is a parasite who usurped Sakia's body or the fact that no one in the cast, not even Saki herself or Aoto, shows more than a token of concern about it. Not to mention she turns fellow human beings into food, that she expresses interest in eating and creates magic that's a suicide bomb superhero. I anyone was on the battleships when she used the EMP weapon in Celia Gate, she just murdered hundreds if not thousands. All with a smile. Maybe no one cares because Saki is so "Cute."
You can't call someone a "parasite" when she was literally forced into Sakia's body and Sakia prefers having her around. She is afraid of the real world and prefers to come out only whenever Saki needs her. As for the DFP, remember that was Katene who told her to use it and it was the only way they had to release Ciela Gate from the Clustanians.
Ridiculously Cute AI: They need to make a Teppo plushie. The Japanese voice just adds to the effect.
Listening to Au Gu Mu during the final battle could also have this effect, as you're hearing the Planet sobbing and crying while she sings.
The true ending is a good one. After centuries of having to cling onto towers for life, the planet is finally freed from its despair and the surface of the planet returns. It gets better if you played all three games and realize that all three parties played a major role in saving the planet.
Woobie: Aoto, at least in Tyria's True ending. The girl that he loves is going to die within a year and there is nothing that he can do about it just so the world will be safe.
At least until the light novels and her Drama CD came around, which shows that Tyria was indeed saved, although that costed the very existence of the Third Tower and almost all of the Second Tower's Rim.