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.
Rozen as a sadistic individual who takes cruel pleasure in watching his "daughters" fight each other to the death for his love, and only intervenes as neccessary to make the game more interesting, such as giving Suigintou her Rosa Mystica after she proves willing to claw and scratch her way to hell and back in search of him, or to ensure they don't decide it's pointless and simply stop it.
Rozen as a callous, indifferently child-like individual who regards his creations as simply that; dolls, and so fit only to do whatever he wants them to do and for his own amusement. He never finished Suigintou because he decided she wasn't interesting enough, and he makes them fight the Alice Games because it's fun and, hey, they're only dolls, what does it matter if they kill each other?
Broken Base: The animated adaptation of Tales, Zurückspulen, has pretty much torn the fandom in twain: between those who like the new but less colorful and much slower, melancholic, and introspective atmosphere of Zurückspulen, and those who prefer the colorful and magical girl-esque tone of the first two Rozen Maiden series. This, despite the fact that Zurückspulen is actually more faithful to the manga than the first two seasons.
This is partially caused by the fact that Zurückspulen is produced by Studio DEEN instead of Nomad, who made the original anime. Detractors of the new anime hate the fact that what is widely regarded as The Scrappy studio of the entire anime industry took over the show, while supporters firmly believe that Zurückspulen in itself has managed to redeem Studio DEEN. This in addition to the style differences mentioned above.
The sentiment that Rozen Maiden is in any way colourful, bright and a kind of Magical Girl series is also completely off-mark. This is a series where 7 sisters fight across the entire multiverse in a free for all battle to kill each other, just to appeal to a god-like father figure. How could that end in anything but bloodshed and tears?
Foe Yay: Shinku and Suigintou have this going on quite a bit. Special mention goes to the opening of Ouverture opening song with the lyrics "is this hatred or love", while showing their hair swirling and knotting together.
Kirakishou and Suigintou in the manga, with Kirakishou showing signs of a sister complex and even offering Suigintou her Rosa Mystica. Though it could just as easily have been a ploy to capture Megu.
Kira even plants a kiss on Hina-Ichigo, though it was more for the purpose of gaining her body.
And then there's Kirakishou and Adult Jun, to the point where she even shows textbook signs of yandere for him. She attempts to torture him into choosing to be her master instead of Shinku's or Suingintou's, and then tries yet another Forced Kiss on him in a way of physically forcing him to make a contract with her (her ring was on her tongue). And as if that's not bad enough, just a few seconds before, she licks and sucks on his finger in a way that's clearly meant to simulate oral sex while saying she 'wants him.' And the clincher? She goes into a complete Villainous Breakdown when Adult Jun says, in no uncertain terms, that he wants nothing to do with her, causing her usually cool and 'cute' demeanor to devolve into hysterical screaming with her vines flailing all over the place. And she wonders why everyone she actually does want to like her can't run away from her fast enough.
"Funny Aneurysm" Moment: Kanaria calls Barasuishou "Bara Bara", which is Japanese for "break apart". She dies by having her body completely torn apart.
Shinku sometimes gets this, due to her largely Tsun Tsundere personality, and her treatment of Suigintou.
And contrary to the above, Suigintou for those who don't find her to be an Ensemble Darkhorse and/or see her as an abusive bitch whose Freudian Excuse doesn't quite cut it.
Suiseiseki for some, particularly those who are sick of her catchphrase.
Also Jun and Rozen.
Megu is seen by many as an extremely callous and manipulative bitch. This really started after it was revealed that she was working with Kirakishou by her own free will because Suigintou keep her promise to kill her, her speech to Jun about how he's worthless, attempting to break Tomoe as well by guilt tripping her over the death of Hinaichigo (which she had no control over), and her generally awful treatment to her nurses before she even left the hospital.
The Woobie: Suigintou in Ouverture, Suiseiseki in Träumend.
This troper can't stop feeling bad for Kirakishou. She is, as much as the other dolls, a victim of Rozen's blind desire for Alice and maybe she had it worse; Rozen just make her as an astral doll without body, unable to ever get a master or even get out of the N-Field and abandoned her as he did with the others, but she was completely alone and that make her insane, to the point of not even caring about her own Rosa Mystica and the Alice Game at all. This troper almost wanted to hug the little crazy bitch when she cried about how badly she wants a body.
Kirakishou: I want a body. Hinaichigo's purity, Kanaria's loveliness, Shinku's nobility, Suigintou's elegance, Suiseiseki's passion, Souseiseki's pain...