While Boris Karloff retains a genuinely frightening presentation of the monster and the messaging is clear (although gene technology, transplants, cloning and the ability to grow organs coupled with A.I. is considerably more terrifying), this picture, viewed through younger eyes or older eyes in a modern context has not stood the test of time. I can be sentimental about its affect on me in the 1970's as a child and recognise its impact on release in 1931, its place in history, but some of the acting is absolutely atrocious and Baron Frankenstein is the most ridiculous and misplaced character and casting I've ever come across.
Review of Frankenstein
