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: The Big O
Fan Preferred Couple: Roger/Dorothy. In the English dub, this is made even more textual byRoger in season 2 by saying to a then deactivated Dorothy that if they had met in another time and another place and if Dorothy were human, then it would have been very likely that they would have fallen in love.
Genius Bonus: The trippy opening sequence features newspaper clippings in the background, announcing veridical events such as the death of the 1950s jazz musician, Lester Young.
Nightmare Fuel: R-D. There is nothing freakier than seeing what amounts to a clone of Dorothy(an emotionally subdued but otherwise nice girl), Slasher Smile and all, screaming maniacally at Roger just as she's about to put a bullet through him. If nothing else, that face...
Also a 'face scare' is Beck's horrifying visage in the dark in his last appearance within the manga.
Another is in the finale, with the eerily grinning and skeletal Big Venus.
Made even worse in one episode of the second season: While being repaired, we see the Big O without its faceplate. It has the exact same head as the Megadeus from that episode. In other words, that thing is what the Big O looks like under all that armor.
Roger asks as Schwartzvald is standing on it's shoulder, "Is that thing Big O's archetype?" It's surprisingly creepy for being a robot, the megadeus equivalent of a fast zombie.
Nightmare Retardant: Schwarzwald is significantly less scary/intimidating when he looks uncannily like Getter 2 with all those bandages.
Tear Jerker: The end of Episode 10 has a pretty major one. Throughout the episode, Dastun has flashbacks to the movie he watched as a child, of the man who shoots the woman he loves at a pier. At one point, he even sees apparently the same woman holding a red balloon. At the climax of the episode, he confronts her at the pier in a real Generation Xerox moment, and re-enacts the final scene of the movie. Then at the very end, there is one final flashback, of Dastun as a child watching the movie, with a young Sybil Rowan, who is holding a red balloon.
And toward the end of season 2, when reality itself seems to be falling to pieces, Dastun comes across a poster for the movie, advertising Dan Dastun as the male lead—and then he promptly runs into the child versions of Sybil and himself. Which means that, as a child, he watched a movie that he had already starred in as an adult, and then later plays out a real life version of a scene from said movie with a woman who may or not have been the actress from the film. I don't think I've ever known something to be so tear jerky andmind screwy at the same time.
Too Cool to Live: Schwarzwald, the only Megadeus pilot that ever gave Roger any real trouble. And the only proper Megadeus pilot other than Roger. Alan was deemed unworthy and eaten by the revived Big Duo, and Alex's Big Fau shut down on its own accord before 'merging' physically with him.
Villain Decay: The anime version of Beck, though considering many people found his Crazy AwesomeLaughably Evil to be amusing as hell, it's not necessarily a bad thing.