Written by Leigh Whannell and directed by James Wan, Insidious was released in 2011 to critical and financial success. Its importance to horror cannot be understated, and it is now, 15 years later, that we can reflect on the film’s original reception, re-review it in the current day, and analyse its relationship to the horror genre as a whole.

Insidious was a landmark piece of horror. When it came out, it was heralded as a terrifying experience supported by well-rounded characters. The Stanford Daily noted it as: “one of the scariest movies to come around in a long time.” Sounds of Cinema congratulated its “compelling story.” These opinions were not rare; there was a real zeitgeist surrounding Insidious, with Roger Ebert noting its dependence on “characters, atmosphere, sneaky happenings and mounting dread.” And they weren’t wrong; the film had an elevated quality to it, and can be seen as a precursor to the “A24 era” of horror. But before we dive into its influence, it’s best we re-review the picture to see whether the original assessment of quality still holds.

Rewatching Insidious in 2026, many of the previously mentioned positives are still apparent. This is still a good film with many scenes of successful tension. It’s also propelled by well-written characters that feel real. There is a lot to love here, but it’s clear that the movie has aged quite a bit, and in some ways poorly. In truth, it’s not nearly as scary as we remember.

This is not to say that the film doesn’t have some frightening moments; it certainly does, but the movie can be considered a spiritual successor to The Exorcist in the way that both films were seen as some of the all-time scariest stories at the time of their release, but appear almost quaint in retrospect. It’s shocking how simple some of the scenes in Insidious are when you weigh how expanded the horror genre has become in recent years. In 2011, creepy sounds on a baby monitor were enough to jolt audiences. Today, such simplicity wouldn’t satisfy a large segment of filmgoers.

In many ways, Insidious can be seen as a movie that allowed James Wan to sharpen his skills as a horror director. Released 2 years later, The Conjuring concentrated many of the techniques seen in the previous film to deliver a horror movie that holds up far better. The reason the latter is superior may also be related to the issues present in the former, notably its comedy and melodrama.

Insidious has a lot of jokes, many of which don’t gel with the movie’s central tone. The comedy rarely works and is perhaps the worst part of the film in retrospect. Concerning moments of melodrama, the movie has well-written characters, which is not in doubt, but it often utilises them in ways that exaggerate emotions unnecessarily. There is no reason why a film called “Insidious” should be this cheesy this often.

But this retrospective should not be to harp on the film’s negatives. Looking back, there is a lot of high-quality filmmaking that may not have been apparent on release day. When it builds tension effectively, the movie uses sweeping camera movements, which are effortlessly uneasy. And while some aspects of the film can be seen as “quaint”, this does not categorise simplicity as a negative. The first half of the story, a straightforward haunted house tale, is where Insidious shines. This portion has a material quality that positions the film in a believable world. The final act does discard this, but the off-beat nature of the story’s ending takes risks which must be commended.

The early 2000s were not a good time for horror fans. The genre was looked down upon, and few films were heralded as A+ releases. Perhaps this is why Insidious was praised so highly in 2011; its positives were amplified, its negatives downplayed, and for the first time in many years, a horror movie was seen as a high-quality picture. It proved that the genre could be more than cheap thrills. In this manner, you could draw a straight line from this film to the “A24 era” of horror.

Insidious showed us that a horror movie could exceed expectations. It stood atop the genre (for better or worse) and inspired the decade to come. The Babadook, It Follows, and The Witch came a few years later. Horror became elevated, and no longer led by monsters and slasher villains. The stories became about something more, and while Insidious does have a “monster” of its own, the script’s strongest parts illustrate a family fractured by an unknown force. While a film like Hereditary isn’t considered the same type of horror as Insidious, the road to its release was paved by James Wan’s approach to the genre.

Insidious is an exceedingly interesting film to rewatch in 2026. And while some aspects of it have aged poorly, there is little doubt of its impact on horror cinema. As the genre continues to grow, one wonders how this year’s releases may be seen 15 years from now. All this speaks of the greatness of horror, a genre that can expand and evolve in ways that are sometimes questionable but always intriguing.