The complaint is universal: trailers give away too much. The best jokes, the major twists, sometimes sequences from the final act. People have taken to avoiding trailers entirely for films they intend to see.
What's less widely understood is that this is intentional, and that the reasoning behind it is more considered than "marketing people don't care".
What trailers are optimised for
A trailer's job is not to make a film sound interesting. It's to convert a specific person into a ticket buyer, and the metric that matters is intent to view.
Marketing departments test trailers extensively — screening cuts to sample audiences and measuring stated intent, recall and appeal. The versions that perform best in testing get released.
What testing has repeatedly indicated is that audiences respond well to clarity. People are more likely to commit to seeing something when they know what it is, what kind of experience it delivers, and that the good parts are actually good.
Ambiguity performs poorly. A mysterious trailer generates intrigue among people already inclined to see the film and loses the larger group who need convincing.
The spoiler research
There's a well-known line of psychological research suggesting that knowing a story's outcome does not reduce enjoyment and in some cases increases it.
Participants given a spoiler before reading a story frequently rated it more highly than those who read it unspoiled. The proposed explanation is fluency — knowing where a story is going makes it easier to process and lets attention go to craft rather than plot.
These findings are contested and have not replicated uniformly, and the effect appears to vary by genre and by individual. But the research exists, it's cited within the industry, and it provides intellectual cover for a practice that marketing departments wanted to do anyway.
My own view is that it conflates two things: whether you enjoy a story you already know the ending of, and whether you'd have preferred not to know. Those can both be true, and the second is what people are actually complaining about.
The economics of opening weekend
The commercial reality that drives everything.
A large share of a film's theatrical revenue arrives in the first weekend, before word of mouth has formed. Marketing therefore has to generate demand from people who have no information beyond the campaign.
Under those conditions, the safest approach is to demonstrate the product. Show the spectacle, show the jokes, show enough of the plot that the audience knows what they're buying.
Withholding creates risk. A trailer that intrigues without explaining might produce a stronger experience for the people who go, and it produces fewer of them, and the second effect dominates the financial model.
The three-trailer structure
Modern campaigns typically release several trailers in sequence, and they have different jobs.
A teaser, early, establishing existence and tone, usually revealing little. A main trailer, closer to release, explaining the premise. And a final trailer, close to release, which is generally the most revealing and is aimed at people who haven't yet decided.
That final one is where most of the complaints originate. It's targeted at the least committed part of the audience, and giving that group more information is exactly what it's supposed to do.
Which suggests a practical strategy: watch the teaser, then stop. That's frequently enough to decide.
The counter-examples
Some filmmakers have successfully insisted on restraint, and it's worth noting the pattern.
It tends to happen where the director has enough commercial standing to override the marketing department, and where the film's appeal rests substantially on the experience of not knowing.
Several notable campaigns have withheld almost everything, and some have been extremely successful. Those successes are usually attributed to the mystery, which may be true and may also be that the films were by directors whose names sold tickets regardless.
The controlled experiment doesn't exist, which is why marketing departments remain unconvinced.
What's actually changed
One genuine shift worth noting: the trailer is no longer primarily a cinema format.
Most trailer views now happen online, frequently on a phone, frequently with the viewer deciding within seconds whether to continue. That environment rewards immediate impact over gradual build, and it explains why modern trailers open with their loudest moment rather than establishing anything.
It also explains the proliferation of shorter cuts — fifteen and thirty second versions optimised for social feeds, which have no room for subtlety at all.
So the format has been reshaped by where it's watched, which is the same story as almost everything else in modern media. The trailer didn't get worse in isolation; it got optimised for a context that rewards different things than the one it was invented for.
The recut problem
A related practice that generates justified complaint: trailers containing footage, dialogue or entire scenes that do not appear in the finished film.
Sometimes this is innocent — trailers are cut from work-in-progress material months before the final edit, and scenes get removed. Sometimes it is deliberate, with shots created or altered specifically for marketing, occasionally to conceal a twist or to imply a different film than the one being sold.
Audiences generally dislike this more than spoilers, because it feels like misrepresentation rather than over-explanation. There have even been legal actions over trailers implying content the film did not contain.
It is a useful reminder that a trailer is an advertisement rather than a preview, and the two have different obligations.