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: Mobile Suit Gundam ZZ
Asspull: Sayla's involvement in the series often gets this response due to lack of foreshadowing or explanation to her actions. It is heavily suggested that her appearance was meant to foreshadow a role in Char's Counterattack, but as her VA was unavailable for the film, this didn't materialize.
Bizarro Episode: "Prelude ZZ" has no particular plot and consists of a long stream-of-consciousness recap and foreshadowing mixed in with occasional acid trips and mobile suit quizzes.
Combined Energy Attack: During the final battle, Kamille Bidan gathers the spirits of the dead to reassemble Judau's ZZ Gundam, then empower his High Mega Cannon for a massive attack against Haman Khan. It still isn't enough to defeat her.
Complete Monster: Rakan Dahkaran, Neo-Zeon's answer to Yazan Gable, who shoots down hospital ships, kills Mashmyre and Hayato, fires on civilians, and changes loyalties the instant he believes he's found someone stronger than his current employer.
In the manga, Glemmy definitely fits the bill. He lacks the sympathetic qualities his anime counterpart had (for example, his crush on Roux) and is immediately shown to be a serious threat - in sharp contrast with Mashmyre, who retains his Anti-Villain characterization - and to be coldly manipulating Ple. At the end of Volume 1, we are shown Ple being cruelly brainwashed in order to make her into a subservient weapon. When a Neo Zeon scientist expresses concern for the girl's life, Glemmy dismisses him as "too soft", and when Judau manages in Defusing The Tykebomb, Glemmy sorties to kill Ple himself. He doesn't manage to, but still... And in Volume 2, it gets worse: in an attempt to lure out the Nahel Argama, Glemmy has civilian villages bombed and massacred, and when the Nahel Argama crew does intervene, Glemmy sends out Ple-2 to kill Judau and Ple - and she does manage to kill the latter. When, during the final battle, Judau calls him out on his actions, Glemmy just smirks and tells him that a few sacrifices have to be done for a lofty goal such as the reconstruction of the Zabi family. Of course, Judau tells him to shove it.
Evil Is Sexy: Haman Karn and Chara Soon, though with contrasting styles.
Fanon: A rather popular in its day theory says that Glemy isn't Gihren Zabi's clone, but his bastard child. The whole "clone" deal would be false, for two possible reasons: either Glemy a) claimed to be a clone to to disguise his true heritage as Gihren's child and the other Zabi descendant (aside of his "cousin" Mineva) from enemies; or b) it was a lie that he came up with as a youngster to psychologically protect himself from such a burden, and then he himself came to believe it as he grew up. It does provide for a rather interesting Alternate Character Interpretation, though.
Fanon Dis Continuity: As far as some fans are concerned, this series never happened. Then again, others will take ZZ over A New Translation any day. Whatever.
Haman Khan fits the trope, though her personality is significantly different from Glemmy's. While she's not quite as deceptive as Glemmy, this is mainly stylistic; she's equally skilled at politics and able to effectively play her enemies off against each other. In addition, her strength of will is beyond question; she is willing and more than able to take to the battlefield when it's called for, whether on foot or in a mobile suit, and she once stood down an attacking mobile suit with bladed hands and didn't even blink. She makes it clear that her goal is to bring the Earth Sphere under her jackbooted heel, and while she doesn't win, she outlasts Glemmy's rebellion against her.
Moral Event Horizon: The Dublin Colony Drop serves as one for most of those involved: Haman Khan (who orders its implementation), Mashmyre Cello (who aims it), Rakan Dakharan (who guns down the civilians attempting to flee it), and the Federation officials (who leave their own citizens behind to die in it.)
Nightmare Fuel: Ple and Kamille go utterly batshit when Dublin is destroyed via Colony Drop. The split-second image of Ple, who was not in the best mental health to begin with, spasming in terror is one of the most unnerving images in the entire franchise. At least for some people.
Also, what happens when Haman shoots Leina. Judau, normally a Hot-Blooded kid, completely snaps in the mom and grandmom of all tranquil furies, with anger and power strong enough to cause Haman to Freak Out and literally cry in fear and be felt by Newtypes who were far away from the place. That is how massively pissed off he was, and it's scary to see. This scene is probably why some consider Judeau to be the Newtype with the strongest raw power.
Retroactive Recognition: Gundam fans who started with later shows and worked their way backwards might find themselves asking "Why does Dorothy have purple hair?"
Too Dumb to Live: In early episodes Judau does not follow orders of repairing the Zeta Gundam just because he doesn't like being ordered. Guess what nearly happens the next time he fights?
Tough Act to Follow: The show is a direct follow-up to Zeta. On the other hand, it's a direct follow-up to Zeta. Needless to say, fan reactions tend to be divisive. See Contested Sequel above.
Villain Decay: Yazan. After being the resident Complete Monster of Zeta and miraculously surviving the final battle thereof, he's subjected to repeated embarassment at the hands of the ZZ cast before being forced to leap from a flying mobile suit. With a poncho for a parachute. You could almost feel sorry for him... almost.
Especially considering he manages to kill one more significant member of the Argama crew before the decay sets in.
Fanon tries to explain this away as a combination oxygen deprivation (after being shot out of his suit at the end of Zeta) and hunger (being forced to live like a bum for a majority of his appearance). That might make his situation A Fate Worse Than Death.