That's the thing with horror movies, you either like them or think they suck and there's never really an in between so when a movie doesn't suck, it's always a pleasant surprise. This year, thanks to Roku and Netflix, I managed to find more horror movies that sucked than were great. However, it was a great experience checking all of the movies out from the comfort of my living room couch.
What makes this film pretty good is that it uses some Hitchcock themes as a backdrop for the plot. The movies that get referenced throughout, Strangers on a Train and Dial M for Murder, were pretty good in their own right, though I don't know that I'd call them horror movies, just good thrillers.
If you like Hitchcock and/or thriller movies in general, you should enjoy this one. It's definitely one I'd consider watching again somewhere down the road, and not too many movies are that way for me.