There's a decent story here about an alcoholic living in the Winchester house who can't tell if he's experiencing withdrawals or something supernatural. Jason Clarke plays Dr. Price, who is invited to live in the Winchester house to give Ms. Winchester an ongoing psychological evaluation. Thing is, he's an alcoholic and Ms. Winchester won't allow him to be intoxicated as long as he's living in her house. So when he starts seeing apparitions, are they hallucinations? Are they ghosts? Dr. Price doesn't know and neither do we. Great setup.
But the movie chooses to go the boring route instead. It sidelines the interesting character study for a contrived ghost plot filled with every horror cliché in the book. What would a horror movie be without predictable, lame jump scares. There's not a single decent scare in the entire movie.
Winchester was a frustrating watch. The potential is right there, but it clutches onto these tired horror tropes for dear life - as if a mainstream audience wouldn't appreciate a deeper, more psychological approach to the material over a haphazardly-constructed, derivative, haunted house flick. It's the studio mentality - make it for a million bucks, we make 20 times that. They don't care about the integrity of the script or the material itself, and neither should you. By the way, this is a true story where 98% of the story is made up. Contradiction? No, marketing.
Again, Winchester is not terrible so much as it is frustrating. And boring. Don't bother with this one.