James Wan directed and Leigh Whannell wrote Insidious, which stars Patrick Wilson, Rose Byrne, Ty Simpkins, Barbara Hershey, Lin Shaye, Andrew Astor and Leigh Whannell. Joseph Bishara composed the music, and John R. Leonetti was the cinematographer. The creative team behind "Saw" and "Dead Silence" delivered “Insidious,” a standout example of the modern haunted house film. While that might not mean much to those who aren’t fans of this type of movie, it does seem to be one of the few horror sub-genre films to receive generally positive reviews. Of course, it isn't flawless; very few movies, especially in the horror genre, escape criticism from both critics and viewers. But for adults who can embrace the unsettling atmosphere and enjoy a good scare, this film is excellent. There’s been considerable discussion about the shift that occurs in the final third of the movie, where Astral Projection becomes the explanation for the earlier frightening events. It's clear the film gets carried away, goes too far, and those last 15 minutes are a disorganized mix of ambitious concepts and clumsy execution. Still, it’s worth noting how often haunted house movies get criticized for lacking originality—something that happened to "Woman in Black," which came after “Insidious.” Here, the filmmakers attempt something different; although it didn't work out as well as they or hardcore genre fans might have hoped, I found it forgivable on a second viewing. It’s similar to enjoying your favorite roller coaster: you love the thrilling twists and upside-down moments, but just tolerate the less exciting stretches of track while your heart rate returns to normal. When “Insidious” is at its best, it's genuinely gripping and disturbing, with perfect pacing that builds from quiet noises on a baby monitor to supernatural beings invading the Lambert family’s home. The mystery surrounding what the entities want, why Dalton is in a coma despite doctors having no answers, and how they followed the Lamberts even after they moved, is compelling. That last point is refreshing; it's a logical progression often missing from other horror movies. The scares are well-placed throughout, and several scenes are so frightening that they linger long afterward—I doubt I’ll ever be able to listen to "Tiptoe Through the Tulips" again without feeling uneasy. The use of photographs and mirrors is genuinely creepy, as is Lin Shaye's appearance as a paranormal psychic, along with the subsequent gas mask scene (though things start to decline slightly after that). It certainly draws inspiration from other horror movies and takes cues from their tone, and the second half doesn’t quite live up to the potential of the first. I’ll even admit one of the creatures is poorly designed, but it does bring something new to the formula, and the cast delivers solid performances—a rarity in itself. It didn't appeal to everyone, but it was a huge box office success, earning nearly $85 million. The market for a good haunted house movie always exists, so despite its issues with the second half, “Insidious” ranks among the best. 8/10

Source on TMDB