While it is clear that The Spierig Brothers are familiar with all the haunted house horror story conventions, they, like Rob Zombie before them, do not seem to be able to effectively use them. A fondness for the genre does not translate into the ability to engage and frighten an audience.
Before anyone dismisses my review as being from someone who doesn't enjoy deliberately paced, creepy stories without a plethora of pyrotechnics, let me state that The Haunting (the original not the crappy remake) and 1944's The Uninvited are two of my favorite films. You don't need a large budget or special effects to make a scary film on the subject of a haunted house. Both Insidious and Sinister demonstrated that with good direction and a decent story you can scare the hell out of an audience.
While Winchester boasts some good actors and a wonderful setting that is fraught with possibilities, it squanders both on a tired story of ghosts looking for revenge, which completely ignores the real facts of the Winchester House. A couple jump scares accompanied by sudden music stings work to a degree, but there is no genuine feeling of suspense generated by the script, no growing sense of escalating dread. Instead we get acceptable performances and some nice looking sets as the actors go through their paces to little effect.
It's not a terrible film, but one which fails to raise the hackles and which you will quickly forget after leaving the theater.