"Visiting Hours" did respectable business at the box office when it first came out, though it was torn apart by critics. To some degree, I do understand why those critics didn't like the movie at the time. For starters, at 105 minutes in length, the movie is far too long and padded out. Many people watching it today will be squirming in their seats from impatience rather than from terror. At the same time, there are a few head-scratching moments that suggest some explanatory footage was removed during the editing stage, like how Ironside's character gets uniforms and other material to disguise himself when going to the hospital. Slasher fans may be disappointed by the lack of gore and blood. In fact, the movie might be rated PG-13 instead of R by today's standards. And William Shatner's character is hammy and doesn't seem to serve much purpose.
But there are some things in the movie that give it merit. For starters, the movie looks very good, much more slick and expensive than most other slashers of this period. Director Jean Claude Lord also does add some atmosphere and some creepy composed shots here and there. The best thing about the movie, however, is Michael Ironside as the killer. He manages to be both extremely creepy and believable. It's no surprise that he went on to become a fairly well-known star after his great performance here.
To sum up, "Visiting Hours" is flawed and no classic, but as an example of the slasher film genre, it's definitely above average, and a must watch if you are a fan of this genre.