Have loved this movie ever since it came out. The production values are strong, and overshadow the limited plot development. Why are these monsters really in this town? Who cares? Stands up on repeated viewings as a solid piece of cult materials. Downside for werewolf fans is that the Wolf Man in here is a secondary baddie (Dracula, like usual, takes top billing), and so doesn't get the attention he richly deserves.
That said, I credit this--along with my grandmother's insistence that we watch all the old Universal monsters movies--with getting me interested in the monster genre. Also, after watching, you will have a strong urge to reintroduce the word "nards" back into your daily speech. Do not resist that urge.