Some years ago, Criterion put out a box set titled "Monsters and Madmen" that included four late-50s B-movies of no particular merit: The Atomic Submarine, First Man into Space, Corridors of Blood, and The Haunted Strangler. While none of these movies are stinkers, neither do any of them rise above the level of Saturday afternoon watchability.
The latter two films on the above list star Boris Karloff, who was in his early-70s. He gives an excellent performance in The Haunted Strangler ... he is easily the best thing about the movie, as a kind of Jekyll and Hyde character. It's fun to see the "Jekyll" side ... you realize it's a rare thing to see Boris Karloff smiling and kindly. He pulls off both sides of his character, and shows a spry physicality that is impressive.
The movie also benefits from solid black-and-white cinematography and the usual B-movie short running time (in this case, 78 minutes). Even at that length, though, The Haunted Strangler is stretched out with mostly unnecessary footage of dance-hall girls doing their routines. The first half of the movie is a bit of a detective story a la Sherlock Holmes, before it moves into horror. It's never scary, but it is a bit gruesome at times.
I only bought this box set because it was a chance to revisit The Atomic Submarine, a favorite from my youth. And I'm glad I got that chance. But other than that nostalgic trip, there is no clear reason why these movies ended up on Criterion. Still, they released a couple of Michael Bay movies, so I suppose anything is possible. 6/10.