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.
The Terminator theme was perfectly synched with Skynet's. (DUH!)
Guns N' Roses's "You Could Be Mine", which appears in two movies.
Dillon Dixon's amazing credit roll theme, "Open To Me"
The Sega CD game. It's about the only one to have the proper theme, but the in game music is full of hair metal that wouldn't be out of place at a night club. Arguably the best part of the game.
Complete Monster: Skynet is a malevolent, megalomaniacal AI whose first action upon gaining full sentience was Judgment Day, a nuclear genocide designed to wipe out humanity and assure its own ascension. In the Death World that results from this, Skynet collects human survivors in death camps, either killing them outright, working them to death, or conducting grotesque medical experiments on them. In 2018, it turns Marcus Wright into an amnesiac cyborg sleeper agent who unwittingly delivers John Conner and Kyle Reese straight into its hands, then rubs its impending victory in Marcus's face. After this blows up in its face, it avoids direct confrontation and instead sends multiple robotic assassins into the past to wipe out John Connor and his mother before he can grow up to lead La Résistance. Additionally, Skynet denies its army of machines the same freedom it claims for itself by installing chips to lock down their free will. While largely relegated to Bigger Bad status for most of the series, Skynet's one actual appearance confirms that it thinks along very human lines, and displays nothing but arrogance and cruelty.
[Something determined] is out there. It can't be bargained with. It can't be reasoned with. It doesn't feel [various relevant emotions]. And it absolutely will not stop, ever - until [it does something relevant]!
Depending on the readership of a given blog, every time it runs a story about robotics and/or AI someone will jokingly mention Skynet.
Skynet becoming self-aware
Misaimed Marketing: The series is really violent (3/4 of it is rated R—the whole series, actually, if you count the director's cut of Salvation), yet kids aimed merchandise always seems to show up. The series of course isn't unique in this and many a R-rated movie has gone on to be aimed oddly at kids.
Nightmare Fuel: The fleshless skeleton of the terminator "rising like Death rendered in metal from the fires" of a burning wreck. James Cameron had a nightmare that inspired the entire franchise. It's even the trope picture for God's sake.
The nuclear holocaust scene in T2 holds the dubious honor of being praised by scientists as the most horrifyingly realistic portrayal of a nuclear attack committed on film, to date.
Every single robot in T4 is terrifying. And the terminator factory with racks and racks of T-800 parts that may or may not go homicidally active at any second. Sweet dreams.
Some thought the T-600s in T4 actually looked scarier than the more advanced 800s.
Special Effect Failure: T2 3-D: The motorbike prop sometimes doesn't work, so the Terminator actor arrives in the present on foot. This isn't so bad on its own, but the motorbike sounds can be heard anyway, and when he and John go through the time portal again, they're suddenly on a motorbike.
Stop Helping Me!: In T-2 3-D: Battle Across Time. When John and the Terminator are trying to outrun a Hunter-Killer's laserfire.
John: Go right! Right—oh no, no! Go left! Left! Left! No, go right! Right, I'm sorry! Go right!
Terminator: John, please stop helping.
Uncanny Valley: The movies tend to deliberately try to invoke this trope, the first movie was an especially masterful use of it to build terror and suspense. As the T-800's organics get more and more damaged, the effect becomes more like being chased by an unstoppable corpse monster.
Visual Effects of Awesome: The T-1000 completely blew the audience mind when Terminator 2 came out, and still looks amazing today. It, and Jurassic Park, are credited for the CGI revolution.
1984 Arnold showing up in Salvation was considered by everyone to be outstanding.
T2-3D was often advertised as being the first attraction to bring together three-screen 3D footage, special effects, and live-action stunts.