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: Event Horizon
Cult Classic: Despite it bombing at the box office and being torn to shreds by critics, Horizon has gone on to have a strong following on home video and cable TV.
Downer Ending: Let's face it - only three members of the crew survived, the fourth (Miller) was sent to hyperspace, where he'll suffer a Fate Worse than Death (though he may have been caught in his own explosion, which would be a mercy), and it's heavily implied that the survivors will have nightmares for sometime to come — and, that is... if the "liferaft" lets them live free to tell tales and didn't just use them as bait. Justin, for one, actually did get pulled into the "somewhere else": thinking he came out with anything like a whole mind (or entirely himself, even) is wishful. Shoving him in suspended animation stopped him dying from decompression damage, but it didn't fix that. Worse: he is eyeless. In this film, that's a strong hint that Event Horizon has marked her property.
Even more horrifying the implication, that the evil in the ship is still present, so people will highly unlikely return to Earth...
Fanon - The movie is considered by many (starting with the community over at /tg/) to be a Spiritual Licensee of Warhammer 40,000, as its storyline coincides perfectly with that setting's history and nature of hyperspace. This isn't enough of a connection on its own to make the instant jump to one particular crossover, but the style and presentation match so well with Warhammer 40k that it's a shock for anyone who watches the movie based solely on this idea to learn that resemblance isn't intentional. Supporting evidence seems to hinge on the film's version of hyperspace bearing a remarkable similarity to what happens to a ship without a Gellar Field.
A Warhammer40k fan who's never seen this movie would easily mistake screen captures showing the horror elements for Chaos at work, right down to the villain's various different looks. The fact that the mundane parts are all dark and gritty helps.
Dark, gritty, covered in corpses, not to mention the Spikes of Doom! And, Meat Moss. Don't forget that.
And then there's the Gravity Drive having what looks very suspiciously similar to a Chaos star.
Another segment of fans see Event Horizon as a Hellraiser film. Weir even transforms into a Cenobite for the same reasons that other Cenobites were created: from regret, pain, and loss.
Doom fans see it as a Spiritual Licensee as well, and many fans consider this movie more like Doom to the actual Doom movie. After all, the story basically a teleportation trip that accidentally breached Hell, releasing all sorts of nastiness when it comes back.
There's even a rather popular Game Mod for Doom 3 that's based off of this film.
Miller: You just get your gear and get back on the Lewis & Clark, Doctor, or you'll find yourself walkin' home.
Weir: I am home.
Narm: Despite being incredibly terrifying and very well done, the final battle between Weir and Miller uses rather silly stock sound effects for each punch. It wasn't so much a problem in 1997, but in today's world you hear the effects in almost every flash animation or cheap cartoon.
Nausea Fuel: Shiploads of it. Let's start with the ship's log and the images Weir shows Miller. Special mention has to go to the scene where Weir vivisects D.J., then leaves his gutted body hanging there for Miller and Starck to find.
It wasn't called Doom, but this was rather faithful to the background story of the game, which was that some scientists in space were experimenting with teleportation, and they created a portal, but instead of taking them from point A to point B, it led straight to hell. And hell's army comes out of the portal and threatens to doom our universe. That's the plot of the movie Event Horizon to a tee, made in 1997. And then 8 years later some people just had to go and make another Resident Evil genetic experiment gone wrong movie and go and entitle the movie "Doom".
The irony there being that Paul W. S. Anderson, the director of Event Horizon, went on to direct most of the Resident Evil series.
What an Idiot/Too Dumb to Live - Justin walks into the engine room and sees a strange black gateway appear in the centre of the gravity drive. What does he do? Attempt to reach into it. Likewise, when Peters sees a hallucination of her dead son, she wanders off to follow him, knowing full well that the ship is trying to mess with their heads. It gets her killed
Consider both are being mesmerized by whatever it is that is in the ship. Remember, the whole ship is alive. Birds don't want to be mesmerized by snakes, but they are anyway.
The same happens to Dr. Weir ("Open the door.") He's too emotionally weak to withstand the ship.
In short, any time somebody on board has a "I'll just do this first" idea, questions need to be asked about why they think they just need to finish this task up, right this second — despite being spooked. Particularly if it isolates them and they've realised that the ship's not right.