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: Babylon 5
Alien Scrappy: The Drazi are the race on which the most problematic and borderline-racist alien customs are dumped, everything from overenthusiastic religious pilgrims to the whole fiasco with the green and purple sashes. The Minbari's warrior caste are a close second, especially due to their asinine habit of brandishing their ships' weapons during all first contact situations.
Frankly, the Drazi come across as a Planet of Hats whose "hat" is not so much a hat as a special helmet they have to wear in order to avoid hurting themselves...
The Minbari warrior caste considers brandishing their weapons during a proper honorable gesture of greeting between warriors. Showing all your weapons without trying to defend yourself could be seen as a gesture of trust and that you're not trying to set up a trap. It's very easy to get misinterpreted when they use their extremely powerful scanners on ships that screw up the scanned target's engines and use stealth sensors to keep them from scanning you.
The Minbari were very isolationist before, so it's possible that it was just some weird Warrior Caste tradition that generally was just used for one group of Minbari Warriors to say "Sup?" to another group of Minbari Warriors. Still, kind of a boneheaded thing for them to do when dealing with aliens.
Still, as has been pointed out, their crying over losing precisely one ship in their Curb Stomp War against earth comes across as more than a little petty and cruel, given that the reason the ship was destroyed in an ambush was because they had ambushed the humans, and the one surviving warship decided to return the favor.
That was a common practice in various colonial wars in 19th century (Earth) history. The handful of occasions where the natives defeated Europeans through clever tricks were condemned as signs of their evil and treachery.
Anvilicious: Boy, howdy. JMS wanted to make an Important Show full of Significant Messages, and he wanted to make sure you knew it. Almost every episode has a moral, usually delivered with a sledgehammer (like Parliament of Dreams). He gets more graceful after the first season, but subtlety is never his priority. By and large, though, most of them are pretty good anvils.
The end of "And the Rock Cried Out, No Hiding Place", where Refa is killed, interspersed with a gospel song about how bad people are going to get what's coming to them.
Base Breaker: Marcus Cole caused huge trouble while the show was being broadcast, with all out war between the fans who thought he was a fun Gentleman Snarker and the ones who thought that he was an irritating Gary Stu who'd only been brought in as Mr. Fanservice. Things got even worse when he died (mostly) at the end of the fourth season, and his anti-fans celebrated while his fans launched a fervent campaign for his resurrection.
Better on DVD, makes it easier to follow the arc-based story structure.
It also makes Season 5's telepath arc better, since you can move along faster.
Jha'Dur, known as Deathwalker, from season 1’s episode of the same name, is a Dilgar war criminal and the worst example her species had to offer. Known for performing gruesome experiments upon innocents, Jha'Dur finds herself upon Babylon 5 and when cornered, she unveils a grand scheme: to offer immortality to the other planets' governments. Earth accepts her offer and Deathwalker reveals the secret of immortality to Commander Jeffrey Sinclair: it would require cannibalism, forcing civilizations to fall upon and destroy each other. The sheer delight she took in watching others suffer was nearly unmatched in the series
Lord Refa, from seasons 2 and 3, started off as an Smug Snake who wanted to “return the Centauri to Glory,” but he's the one who started Londo off on his Start of Darkness, making him ask Morden, the Shadows' servant, for favors. He's the one who began the Narn/Centauri War and authorized the illegal weapons the Mass-Drivers used against the Narn Homeworld, killing hundreds of millions. Refa's only loyalties were to himself and his own ambitions and he thinks nothing of condemning countless innocents to death
Creator's Pet: An awful lot of minor characters early in the 5th season seem to go on at length about how amazingly awesome Captain Lochley is, to the point of her getting a standing applause by a mess hall full of personnel after going on a tirade at Garibaldi.
After being criticized for showing a rabbi singing and dancing along to the eponymous gospel song in the episode "And the Rock Cried Out, No Hiding Place," JMS claimed he hadn't realized it was a New Testament-exclusive song. One wonders if he ever actually listened to it, since it's a song about sinners trying to avoid the wrath of God on Judgement Day, and name-checks Jesus repeatedly. Presumably, the Rabbi was going along with it to be polite, and it was an interfaith session given the presence of aliens.
The Stockholm Syndrome is called "Helsinki Syndrome" in "The Illusion of Truth". Since Die Hard made the same error, it could be an homage or have otherwise inspired its repetition.
Crosses the Line Twice: Cartagia walking up to Londo & Co. in his pure white suit, except for his entirely blood-red hands, and in a bored tone of voice, talks about how his torturers—"excuse me, pain technicians, the used to be called torturers but ever since they got organized it's been pain technicians"—just couldn't manage to make G'Kar scream, and, well, he'd just had to do it himself... On its own, the scene would be horrifying, but between the way the scene is written and Wortham Kimmer's utterly bored delivery as Cartagia you can't help but laugh.
Then he pours the bloody water he rinsed his hands in on some flowers in the garden, to help them grow.
What really sells the comedic aspect of the scene is Vir's facial contortions as he listens in growing horror to the Emperor.
Crowning Music of Awesome: Quite a few over the show's run. Special mention goes to "And The Rock Cried Out No Hiding Place."
And the music playing at the end of the very last episode.
The bar music in “The Face of the Enemy” playing when Sheridan is arrested thanks to a brainwashed Garibaldi.
Draco in Leather Pants: Morden in the official spin-off novel The Shadow Within, which most fans consider non-continuity as a result. Specifically, the novel's depiction of Morden joining the Shadows not for cowardice, gain, or because he agreed with their ideology, but because they Mercy Killed his family, who were trapped in an eternal instant of agony by a jump accident.
Fandom Rivalry: During the original broadcast, it was practically compulsory in online fandom to hate on Star Trek in general, and in particular Star Trek: Deep Space Nine. This was worsened by Straczynski's claim that Paramount had plagiarised the concept of Deep Space 9 from early Babylon 5 pitch documents. Even at the time, however, a lot of fans quietly enjoyed both shows, and it's now perfectly acceptable to be a public fan of both.
And it should be noted that the rivalry existed almost exclusively within the fandom. The cast and crew of both shows felt no hostility towards each other, and would often congratulate each other on well done episodes. This was most evident when Majel Barrett, Gene Roddenberry's widow, guest starred in an episode of B5. Though Straczynski has also said that he considered making an appearance on DS9 to reciprocate, but decided against it due to how seeing his face would likely cause many fans to instantly shut off the TV.
Fanon Dis Continuity: Babylon 5 had four seasons. And no TV movies save for "The Gathering" (which is more properly a part of the first season) and "In The Beginning".
To explain, Seasons 2 - 4 are the height of canon. The first and last seasons can be jettisoned. The Films and Season 5 are mostly self contained, so they can be disregarded easily. Season 1 has a different lead, so the new commander works as a PoV coming in on season 2. Crusade and Call to Arms tend to get grouped because the latter is a Poorly Disguised Pilot for the former.
Although a fair number of fans, particularly those who saw the show on DVD rather than first airing and so didn't feel the effects of Arc Fatigue in the first half of season five, consider that season just as good as the rest.
Genius Bonus: In 1848, Giuseppe Garibaldi led the Italian revolutionaries known as Red Shirts. "Red shirt" is a fan nickname for the disposable security guards on the original Star Trek. On B5, the head of station security is Michael Garibaldi.
Growing the Beard: The show really grew into it's own around season 2, so much so that some fans recommend skipping season 1 entirely.
Harsher in Hindsight: One of Zathras's most memorable lines is "[Zathras] probably have very sad death." The actor playing him, Tim Choate, died in a motorcycle accident.
Franklin's musing on the briefness of human life in his debut episode. His actor Richard Biggs only lived half of one.
The scene after Londo gets G'Kar removed from the council, where Sheridan tells him that he'll miss him and how the council just won't be the same without him. The actor playing G'Kar, Andreas Katsulas, died from lung cancer in 2006, and was mourned by all the rest of the crew.
"And the Sky Full of Stars" features Sinclair being drugged and suffering from delusions. It was revealed after Michael O'Hare's death that he suffered from schizophrenia, which was the real reason he left the show after the first season.
A more in-universe example: At the beginning of Walking Through Gethsemane, Ivanova asks Brother Edward if he wants to place a wager on a chess match. Brother Edward replies that gambling is a lesser sin, and he always felt that if you're gonna sin, go for one of the really big ones. This joke takes on a new light when it turns out that before he had his memory wiped, he was a Serial Killer.
Londo and G'Kar from late season 4 on. Lampshaded in a season 5 episode when two workers who encounter them for the first time comment on their relationship with: "How long have they been married?"
The irony is, they technically have been married, at least according to Minbari tradition, since the middle of Season One!
Except G'Kar didn't eat the red fruit, nor did he and Londo exchange long, meaningful glances- just the joke of them being at the ceremony. Delenn, on the other hand, might have some claim to the Valen estate.
Les Yay: I mean, come on. Talia and Susan? Is it not that obvious? When they had their sleepover, the sexual tension could have been cut with a knife!
Word of God says they actually did have sex the night Talia stayed over at Ivanova's place. Later Ivanova says "I think I loved Talia."
Magnificent Bastard : Londo Mollari is either a Magnificent Bastard or a Tragic Hero, depending on the episode— sometimes both at once. He's vastly entertaining to watch, but once his machinations begin to spin out of control, everyone knows it, and his few friends stop liking him.
Bester qualifies as well, managing to get the upper hand every time with even the protagonists impressed by his evasion of karmic justice. He slips into Smug Snake at times, though. Too many of the heroes think just shooting him is a reasonable option.
It should say something about Bester that even Doctor Franklin, a through-and-through pacifist, feels that Bester needs to be shot.
Sheridan comes perilously close to crossing it when he orders the use of human telepaths altered by the Shadows as weapons against Earthforce. Only the fact that he does it reluctantly and fully understands the implications of what he's doing prevents him from fully succumbing to the MEH.
The Season 5 episode "Learning Curve" shows the Rangers as a violent, completely unaccountable paramilitary group who will violently avenge any offense against one of their members with no regard for local law enforcement or due process.
Narm: That immortal line from the Season 2 episode Spider in the Web. "I'm already dead, Mr. Security-Man!" Who didn't ROFLcopter at that line?
Rewatch Bonus: The carefully plotted out nature of the series means that there's so much about it that you'll never pick up on a first time viewing. Almost every one of Kosh's weird cryptic statements takes on new meaning later in the show. For example; "The avalanche has already begun. It is too late for the pebbles to vote". Think about that after we learn about how the war with the Shadows is basically a sort of cosmic game between them and the vorlons. With that going on, their concerns really are trivial.
Although even these days, you don't really see any shows where the creator went so far as to plan out the entire story from day one.
The Scrappy: Byron. Mention him on a board with a lot of B5 fans, and watch the flames pour in.
Replacement Scrappy: Captain Lochley. In-universe, Garibaldi doesn't particularly care for her either.
Seasonal Rot: Season 5 isn't held in very high regard, mostly because the Myth Arc was already resolved so it felt pointless. JMS didn't like it himself but forced to make it by the execs. Not as bad as most examples as many simply regard it as So Okay, It's Average compared to the first four seasons.
Special Effects Failure: The version of the Drakh that appears in one scene in Season 4 is never seen again, and for good reason: it looks like someone got ahold of Rick Moranis's Dark Helmet costume and spray-painted it to look like Skeletor. Even filming it through a deliberately blurred lens can't make it look like a living creature, and not a hunk of rubber or plastic.
A couple of episodes of Crusade introduce that kind of Drakh again with a better make-up design, with the implication that the Drakh have a Fantastic Caste System with that type as a warrior and the one we saw on Centauri Prime as a leader caste. Also, Word of God eventually admitted that the blur effect was because they tried to get the actor to do weird alien movement and it just looked stupid.
Strawman Has a Point: After Garibaldi is brainwashed, he develops an irrational hatred of Sheridan. While his accusation that Sheridan has started to buy into his own messianic hype is completely bogus, he has a point when he compares Babylon 5 to a military dictatorship.
For all intents and purposes, it was a military dictatorship, but one that tried to be benevolent while still keeping in mind its higher purpose.
A number of Strawman Political characters who visit the station browbeat Sheridan for not taking into account the political ramifications for Earth of his decisions. Considering that he is effectively Earth's ambassador on Babylon 5 in addition to being a military commander in a key region of space, he really should be considering the policies being pursued by his government and how his actions will impact them. He might be less inclined to do so once he finds out President Clark had his predecessor assassinated.
See also, Neroon in s03e19, Grey 17 is missing, as shown in this clip
Too Cool to Live: Kosh. He even lampshades this, telling Sheridan that he knew it had to happen but was in denial and had become scared of the concept of death after living so long.
Trapped by Mountain Lions: Several episodes have major, galaxy-wide ranging A-Plots with B-Plots, who while they might be of great consequence to a specific character, seem petty in comparison to the main plot. Most noticeable is Dr. Franklin's stim addiction problem and subsequent journey to find himself - while the Shadow War is raging.
Franklin eventually gets a pretty major What the Hell, Hero? speech for running off on his friends while the fate of the Galaxy was in question. By himself, no less.
Ugly Cute: The pak’ma’ra. Their dull, bovine eyes and tentacle faces make them rather appealing in an odd way.