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.
Is Gatsby a manipulative and scheming stalker; or a broken man who idealizes Daisy, and pursues that idealized version of her?
Jordan Baker; just as bad as everyone else, or a product of the times (explaining her cheating and lying)? Or is she just a cynical person from a wealthy background who isn't really friends with the Buchanans, and just snarks behind their backs (the 1974 version seems to support this theory)?
Tom Buchanan: a brutish, racist abuser, or just a jealous man in a loveless marriage?
Daisy Buchanan: shallow and flighty? Materialistic and manipulative? Or a Broken Bird trapped in a marriage with a man who possibly abuses her?
Nick: he spends the entire book talking about how kind and decent he is, how he doesn't judge people, and engaging in tragic-hero-worship of Gatsby, but when he knows someone's out to kill him (and is in a position to at least try to stop the death of this man he supposedly admires so much), he just stands by and lets it happen. Honest, decent Midwesterner, or just as much of a hypocrite as everyone else in the book? Not to mention being aware of the various affairs transpiring around him, but choosing to keep his mouth shut.
Myrtle: Is she a shallow Gold Digger who is obsessed with social climbing? Or is she a working class victim trapped in a snobbish society, who is married to a man she does not love and loves a man (Tom) who just uses her for sex?
Both Jordan Baker and Nick Carraway have heaps of Homoerotic Subtext around them — Nick is almost certainly in love with Gatsby, and left feeling hollow at the prospect of an aging bachelorhood.
Anvilicious Let's just say the book's message can simply be boiled down to "No amount of glamor and/or money can ever get you back what you really want". As shown through the various decidedly unsympathetic rich characters.
Ending Fatigue: To a certain extent, although it could also be "starting fatigue". The plot moves very slowly until all of the characters go to New York around chapter seven or eight, at which point it speeds up significantly, then slows down again when they leave.
Harsher in Hindsight: Meyer Wolfsheim, the Jewish mobster, works in an office labeled "The Swastika Holding Company." The book was written in the 20s. Oh boy.
Interestingly, the book was not well known until it was republished and hit the peak of its popularity immediately after WWII.
Not to mention Nick referring to the Murder-Suicide using the term 'holocaust'.
Headscratchers: Nick mentions at the beginning of the book that his family is considered to be quite prominent and well-to-do in the Midwest. Yet when asked why he won't marry the girl he left in the Midwest at Tom and Daisy's, he says that the rumour isn't true because he's too poor.
Ho Yay: Nick seems quite... obsessed with Gatsby, pretty much all the way through the novel. "There was something gorgeous about him"? Not to mention the Nick/McKee scene at the end of chapter 2.
Albeit it should be noted that much of this is the result of language drift since the novel was written - as per the example above, which uses 'gorgeous' in its original sense of 'splendid' and/or 'showy'.
Look at Nick's excuse for coming east, mentioned in his first meeting with the Buchanans. He used to spend a lot of time with a girl as Platonic Life Partners, but everyone drew the wrong impression and started expecting him to propose, which he didn't want to do. Why not? The novel never answers, leaving readers to decide whether they were Like Brother and Sister or The Beard.
The video game drops all subtlety, having Nick as the hero and, most importantly, Gatsby as the Distressed Dude Nick has to save.
Hype Backlash: Many classes at the college and high school level take offense at the 'definitive American novel' title based on the stupidity of its characters and the soap opera nature of its plot. Just as many argue that Fitzgerald wanted to attack East Coast Rich Bitch lifestyle with a thinly veiled Take That.
Love It or Hate It: The book is considered to be one of the best books in the English language to some. Others consider it to be utterly boring and pretentious. Unfortunately, a lot of this is because this book is on many high school reading lists, forcing many a teenager to unwillingly read a book intended for an audience many years older than them.
Misaimed Fandom: The story viciously and repeatedly lampoons rich, upper-class American society. Guess what sort of parties are Great Gatsby-themed? (Ex: Greek, "The Great Cappie")
Also, those who feel inspired by the book to pursue their dreams of money and social status, ignoring how Gatsby amassed his wealth through criminal activity and the way it turns out that his image of Daisy, his real goal, was naught but an idealized dream.
Similarly, Lauren Conrad continually points out how much she loves the book because she's "obsessed with the style of the 20s!".
People hate on Daisy for rejecting Gatsby, when there are much worse characters than her in the book. Like for example, Tom, who beats women, cheats on his wife, and is actually responsible for Gatsby's death.
Values Dissonance: Tom Buchanan's admiration of racist books, for starters. Then later, Tom bashing the idea of interracial marriage. Either invoked intentionally to comment on the nature of times, or to establish further that Tom is a jackass. (Daisy gives token agreement but nothing more. Nick remains silent, as an Audience Surrogate ought.)
Vindicated by History: The novel was forgotten during the Great Depression and WWII, and didn't sell that well when it was first released.
The Woobie: Gatsby, in a way, though most of it is his fault. Also, his father. and
Jerkass Woobie: Daisy could be considered this. While she does have both a troubled past and present life (stuck with a Jerkass husband), it still doesn't really excuse her casual dismissal of Gatsby following the latter's death.
The 2013 movie:
Award Snub: A lot of critics were disappointed that Lana Del Rey's "Young and Beautiful" didn't get nominated for Best Original Song at the Oscars. And despite that one of the nominated songs, "Alone Yet Not Alone", got its nomination revoked due to violating the promotional regulations, "Young and Beautiful" didn't get to fill the spot.
On that note, letting a director known for his flashy, indulgent style adapt a novel condemning that very style. Some think it's a good idea, others think it's a horrible one. Some might argue it's Baz's method of a deconstruction.
Critical Dissonance: Critics gave the movie mixed reviews with a 50% rating in Rotten Tomatoes. However, the movie was doing well in the box office, landing at No.2 when it first came out. Its critical reviewers' score also sits at about 50%, whereas the viewers' score is over 80%.
Filter's Cover Song of "Happy Together" by The Turtles which was used in the second trailer. Sadly, it's not included in the soundtrack since this song is first used for the OST of the 2009 film, The Stepfather.
"Young and Beautiful" by Lana Del Rey couples as a Tear Jerker. Especially when considering it's written from Daisy's perspective.
The opening of the movie has a marked similarity to Baz Luhrmann's other film Moulin Rouge! where the protagonist is introduced mourning the death of his beloved and is used as a Framing Device for the rest of the movie.
When Nick is brings Daisy to meet Gatsby at his house, he stays outside of the room and hears her shocked reaction (which he assumes is to seeing Gatsby). His expression can easily be compared to a situation involving I Just Want My Beloved to Be Happy.
Especially now that Gatsby is played by Leonardo DiCaprio, Gatsby is being treated as a Tragic Hero by fandom, for all the wrong reasons. The Fandom sees him as the ultimate Woobie who lost out on his true love. In the story, Gatsby is a Tragic Hero, not necessarily because he failed to end up with Daisy, but because he dedicated his endless talent and ambition trying to become part of a society that cared nothing for him.