Every book is a new journey to embark on. I mainly read romances, but I dabble in other genres too.
So apparently Hallmark made a Frankenstein tv mini series back in 2004 (on DVD it's edited into a movie), and it actually follows the book pretty closely. Yay! It doesn't have the production quality of a blockbuster movie, but it's still quite good. I think they did a great job in channeling the spirit of the book. For instance they did not play up the horror aspect, but instead portrayed Frankenstein as a tragedy. The creature also follows the desciption in the book.
I think it's completely worth a watch if you're a fan of Mary Shelley's novel.