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.
Anticlimax Boss: The first game final boss. To beat him, Emily/Edward must cross the flooded room and reach the altar while dodging the Deep Ones and the fireballs, then put the talisman on the altar, light the lamp, and eventually throw it right in the tree.
Complete Monster: Alan Morton of The New Nightmare was a Creepy Child who developed an obsession with the monsters in the shadows. When he grew up, his obsessions increased to the point where he began experimenting on corpses to help the creatures escape from the World of Darkness into earth. Alan eventually resorted to vivisecting human victims, among whom was his own father. He also enslaved his brother Obed to help with his schemes. By the time of the game's events, Alan intends to open the gate to the World of Darkness, unleashing its eldritch bisophere to cause The End of the World as We Know It.
Goddamned Bats: In the 2008 game, Vampirez are bats that attack if the player gets too close and are almost impossible to hit. Since they look like bats and are minions of Lucifer, they could be literally considered to be Goddamned Bats.
During Edward's narration intro in the first game, he noticeably slurs slightly as he talks, sounding as if he's slightly drunk. Taken even further that in his image to the right, there is a bottle of alcohol on his desk.
Narm Charm: While the original trilogy has its share of Narm, it's mostly of the enjoyable sort. The polygonal graphics are extremely cartoonish, contrasting with the darker environments of more modern survival horror games and making the appearance of the Off Model characters more frightening than the monsters. While the first game focused on puzzle-solving and evading monsters inspired by the Cthulhu Mythos, the other games went in more action-oriented and more over-the-top directions: the second game included the hero gunning down zombies with a Thompson while dressed in a Santa Claus costume while the third had Carnby mowing down cowboy zombieswith a Gatling gun. The cherry on the cheesecake is easily the So Bad, It's Good voice acting: almost every text is read by an over-the-top narrator, often with overblown drama and ridiculous accents.
Older Than They Think: Resident Evil is often credited for inventing Survival Horror, when all it did was coin the name for it and bring the genre into the mainstream. The Alone In The Dark series invented the actual gameplay model years earlier.
Padding: The 2008 game will not let you proceed to new areas until you've destroyed a set number of evil trees that are spread out all over Central Park.
The Scrappy: Sarah Flores in the 2008 reboot, considering how annoying and useless to the plot she is.
Scrappy Mechanic: The inventory system in the reboot. Trying to find the right items while being attacked? Have fun trying to navigate the unintuitive and difficult to use inventory system that will end with you never picking what you need.
Driving was flaky, hard to control, and added a lot of Fake Difficulty to the game.
The New Nightmare has Respawning Enemies that refill every room any time you leave and come back. This being a Survival Horror game, health and ammunition pickups never self replenish. Infinite bad guys, finite supplies; you do the math.
Seinfeld Is Unfunny: While the graphics of the first game may not seem impressive now, they were considered cutting edge back in 1992.
The series pretty much invented the Survival Horror video game genre, inspiring many other franchises, such as Resident Evil, many of which greatly improved upon the formula, making the game mechanics seem dated in comparison to some people.
Sequelitis: The second game is generally seen as one of the worst in the series, due to a combination of rushing it out to try and capitalize on the original's success (the director later acknowledged in an interview that they knew the game was buggy and unbalanced, but weren't concerned about the quality) and attempting to cash in on Wolfenstein 3D's success. The end result is it's essentially a shooter, but it made no attempt to change the base gameplay (you'll often end up getting shot at from offscreen, and in the unlikely event that you do manage to get an enemy in your view, good luck aiming at him) and ends up borderline unplayable. The entire "horror" thing is also completely absent, with it taking the little moments of silliness that were common in contemporary horror games and cranking them up to eleven until the game became a self-parody. It really says something when the most famous part of a "survival horror" game involves bludgeoning zombie dwarf cooks to death with a frying pan while wearing a Santa outfit. Fortunately, the third game reintroduced the adventure elements from the original and took itself a bit more seriously
Soundtrack Dissonance: The second game keeps a light, upbeat track for most the game, even when Elizabeth is summoning black magic.
Of particular note is the third game, which uses bouncy banjo music (albeit with a more appropriate dark tune playing alongside it) for most of it.
Special Effects Failure: In the 2008 reboot, there's a gameplay mechanic that shows scratches and wounds on Edward's body the more he gets hurt. The problem is that the wounds look like they were just glued onto Edward's body, which makes it look incredibly fake. And in some cutscenes, wounds would sometimes glitch and hang off of Edward's character model.
Strangled by the Red String: The rather forced relationship that develops between Carnby and female companion/sidekick Sarah Flores in the 2008 Alone in the Dark.
That One Level: the insanely frustrating driving level down 59th Street in the 2008 Alone in the Dark, because the steering is lousy. Though some believe the look and sound of that level make up for it.
And the driving section with the bats, coming soon afterwards, where they drag your car up (possibly to your doom) and/or stop sticking to it completely at random; the black goo, which might or might not react to your flashlight, eating you up; and that final driving section, timed, where it's plenty possible to miss the right turn at the end.
Uncanny Valley: Due to the early 3D graphics, most of the human characters in the original trilogy can look really terrifying, especially Grace Saunders in 2.