Frankenstein Meets the Wolf-Man
This is a pretty good Wolf-Man sequel, but only an okay Frankenstein movie, not helped by the Monster's dialogue (and most of the explicit references to the last movie) being deleted. And I really don't know what to make of the spontaneous musical number in the middle.
Son of Dracula
This is a pretty interesting and well made mix of vampire movie with noir and Southern gothic elements, but Chaney is pretty badly miscast as Dracula.
House of Frankenstein
This has some good scenes and ideas, but it's mostly lame and a waste of a good concept. For all the to do about getting the big three monsters together, they don't share a minute of screen time between them. Hell, Dracula comes and goes before the Wolf Man and the Monster even show up.
House of Dracula
More of the same, better in some ways than the last one, and worse in others. The mad scientist character is actually more interesting than anything else on hand, oddly enough.