Justice League vs. Teen Titans / YMMV

Base-Breaking Character: Damian Wayne. Some feel that this film gives him some much needed emotional maturity and character growth that feels genuine, others feel that Damian hasn't changed and that his character moments here where he feels more humbled and learns a valuable lesson are essentially rinse and repeating his arcs across the previous films, and that he's more or less the same as ever.
Big-Lipped Alligator Moment: When Trigon's demons attack Raven at the carnival, the Titans change into their costumes by way of a Sailor Moon-esque transformation sequence, even though nothing of that sort has been done in any kind of DC animation before, and it seems to go on much longer than you'd expect when it's just Starfire, Beast Boy, and Blue Beetle (Raven magicked up her costume earlier and Robin...had to run to the car to get his sword).
Broken Base: The idea to have the Titans' first prominent role in a movie with the Justice League is divisive. One side thinks they play off of them well while still standing on their own. The other side thinks that they get overshadowed in their own movie. ^note
Crosses the Line Twice: Superman's method for breaking Flash out of his possession by Trigon? Breaking his leg. Rather brutal, but Barry's reaction once he finally comes to it was sells it as hilarious.
Die for Our Ship: Whilst there are fans who liked it, certain others really aren't fond of the Ship Tease between Damian and Raven which isn't helped by the divided opinion on Damian in these films and the age gap between (presumably still) ten year old Damian and fourteen year old Raven, especially when compared to pairing Raven with Beast Boy (in certain continuities an Official Couple) or even notably, some who feel that if Raven is to be paired up with Robin, then Dick not Damian should be the option (age gap notwithstanding, apparently). (Or people who prefer the Les Yay pairing of Raven and Starfire, though this continuity has age gap issues between them as well.)
Hilarious in Hindsight: Flash suggests dealing with Damian's discipline issues by sending him to boarding school and Batman glares at him. In The Death of Superman, Batman mentions that he has to miss a Justice League meeting to attend a parent-teacher conference at Damian's boarding school.
Just Here for Godzilla: A not-insignificant number of Teen Titans (2003) fans watched the movie just for Starfire and Nightwing. Whatever else they thought of the movie, most viewers enjoyed their scenes.
Narm: Damian's line about Blue Beetle just wearing a weapon whilst Damian is one would have carried far more weight to it, if; a) Beetle's Scarab wasn't permanently bonded to his body and thus for all intents and purposes is an extension of his body. b) Beetle wasn't seriously holding back in their fight. And c) if Damian hadn't just used a grenade (from his belt... which he wears) in a sword fight. It comes off as Damian trying to sound more badass than he is (which fits his character, but still).
Narm Charm: The Transformation Sequence (especially Kory's part) plays out like a blatant homage to Magical Girl anime, but it still manages to look pretty awesome.
Pandering to the Base: With the New 52 reboot, many fans were unhappy with the retconning of Cyborg's origin to make it intrinsically linked to the Justice League, completely removing his history and friendships with the Teen Titans. This movie has Cyborg becoming a Guest-Star Party Member with the Titans, and Beast Boy doing a wink and nod diss at the idea of Cyborg being a member of the Justice League over them.
Questionable Casting: Taissa Farmiga's Raven has become a particular point of contention. Some believe she makes the character sound believably subdued without being monotonous, and that her performance thus fits the character's reserved and somewhat snarky personality. Others think she went overboard in trying to sound stoic, and consequently sounds like she's phoning it in. Others just want Tara Strong.
Take That, Scrappy!: For fans who find Damian to be an annoying little asshole, it can be pretty satisfying when after talking a little too much shit, Blue Beetle blasts half his face off.
They Wasted a Perfectly Good Plot: The last time Lex Luthor was seen during The Stinger of Justice League: Throne of Atlantis, he was attempting to make a proposal to Orm in prison, evidently setting up a future appearance by a version of the Legion of Doom. Whilst that does happen in this film, not only is Orm not one of the members, but Lex Luthor's big plan apparently amounted to no more than putting on his exosuit and challenging the Justice League to a fight. One which they lose within the first ten minutes of the film, thus wasting a potential story involving the Legion against the League. Even Superman lampshades that for how smart Lex is supposed to be, this was an incredibly dumb decision to make.
Unintentionally Sympathetic: Arella, Raven’s mother, who gets denounced as a fool who was easily tricked by Trigon’s cult and by her own daughter no less. None of the Titans acknowledge that she was brutally raped by Trigon, even if she consented at first, and a lot of Raven’s dialogue about her comes off as victim blaming.

YMMV / Justice League vs. Teen Titans

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