History YMMV / CrisisOnEarthX

* AlternativeCharacterInterpretation: Some fans believe that the real reason why Felicity made a 180 on her opinion of marrying Oliver was because she wanted to be remembered as the wife of the Green Arrow. This was after Eobard gave her TheReasonYouSuckSpeech by revealing that, in the future, everyone remembers Green Arrow, Black Canary, and the Flash, but no one remembers ''her'', and only supported by Felicity's abrupt decision to tack on her wedding to Oliver to Barry and Iris' own wedding soon afterwards. Most ignore or downplay the fact that Felicity almost died at the hands of Dark Arrow right in front of Oliver's eyes might have also played a factor.

* HilariousInHindsight: In the ''Arrow''-part Oliver angrily reminds Kara and Barry that he hasn't superspeed like the other two do after they had to wait for his arrival. But guess what? [[Series/Elseworlds2018 The next time]] the three of them meet, Oliver ''has'' superspeed thank to [[FreakyFridayFlip changing lifes with Barry]].

* AudienceAlienatingEnding: While the rest of the crossover is mostly well-regarded, the ending (to be exact, the infamous double wedding) is considered to be one of the absolute low points of the entire Arrowverse and a major NeverLiveItDown moment for [[BaseBreakingCharacter Felicity Smoak]]. Many cite it as one of the reasons for the decreasing viewership of ''Arrow'' Season Six from that point onward (as that is Felicity's home show and those same fans just plain didn't want to see her again after what happened), though Season Six's notorious SeasonalRot certainly didn't help.

* EvilIsSexy: Dark Arrow, Overgirl and Prometheus are all Nazi bastards but there's no denying they are all pretty good-looking all the same. Overgirl in particular has her admirers, the same fans who lusted after Supergirl when she was affected by Red Kryptonite.

** Upon meeting Alex and Sara in "Part 1," Overgirl says "[[FourWeddingsAndAFuneral One wedding, two funerals.]]" She's wrong; "Part 4" ends with two weddings and just one funeral.

* EvilIsSexy: Dark Arrow, Overgirl and Prometheus are all Nazi bastards but there's no denying they are all pretty good-looking all the same.

* WhyWouldAnyoneTakeHimBack: Many fans cannot believe Oliver agreed to marry Felicity after [[NeverLiveItDown she interrupted Barry and Iris's wedding vows to tack on their own wedding instead]] -- after their friends' ''original'' wedding had already been interrupted and ruined by ''invading Nazis from another Earth''. As these fans pointed out, such a [[ItsAllAboutMe self-centered action]] is usually considered a massive red flag, and that it makes more sense if Oliver had broken up with Felicity after what happened instead of agreeing to make a lifelong commitment with her.

* {{Wangst}}: Felicity's constant bitching about not wanting to marry Oliver during the second part of the crossover, to the annoyance of the majority of the audience. Especially since all Oliver wanted to do was talk about it, not insist they get married right at the moment. It made what she did at the end of the crossover so much worse.

** Thanks to a quite clever inversion of SpoiledByTheFormat, the rest of Team Arrow. Part 2 features an early scene with Curtis that gives the impression they'll be sitting this one out, but then they do show up in the flesh, and since this is technically an ''Arrow'' episode the actors' names in the credits wasn't a tip-off.

* AudienceAlienatingEnding: While the rest of the crossover is mostly well-regarded, the ending (to be exact, the infamous double wedding) is considered to be one of the absolute low points of the entire Arrowverse and a major NeverLiveItDown moment for [[BaseBreakingCharacter Felicity Smoak]]. Many cite it as one of the reasons for the decreasing viewership of ''Arrow'' Season Six from that point onward, though Season Six's notorious SeasonalRot certainly didn't help.

* SignatureScene: The FinalBattle between the Nazis and the Earth-1 heroes, starting with the PowerWalk and the CrowdedCastShot of the heroes lining up and then including {{Mirror Match}}es between Green Arrow and Dark Arrow, Flash and Dark Flash, Supergirl and Overgirl, as well as the Waverider and the Nazi Waverider.

* HilariousInHindsight: In the ''Arrow''-part Oliver angrily reminds Kara and Barry that he hasn't superspeed like the other two do after they had to wait for his arrival. But guess what? [[Series/Elseworlds2018 The next time]] the three of them meet, Oliver ''has'' superpowers thank to [[FreakyFridayPlot changing lifes with Barry]].

** It's basically four straight episodes of your favorite characters beating the shit out of Nazis, aka the ''ultimate'' AcceptableTargets. What more could you ask for? Many women, minorities, and LGBT viewers noted how satisfying it was to see white supremacist fascists presented as unambiguously evil and punished accordingly.