Peter Cushing [Star Wars, Horror of Dracula] is great as Frankenstein. He is always such a powerful and passionate actor who bring his considerable skills to every role he undertakes. Simon Ward [Zulu Dawn, The Three Musketeers] plays his faithful assistant Karl and Veronica Carlson [The Horror of Frankenstein, Dracula Has Risen From the Grave] plays his fiance Anna. Both are quite good and work very well with Cushing.
Director Terence Fisher [The Curse of Frankenstein, Horror of Dracula] simply knows how to make great horror films. The pacing is good and there are lots of moments filled with tension and suspense. Kudos to the set and costume designers for their beautiful work on this film that furthers the reputation of Hammer as one of the finest studios, horror or otherwise.
There is nothing to dislike in FMBD. Enjoy this entertaining and well-made film.
For more info check out the film's entry in IMDB.