I finished I Am Legend
, the edition I have has some Matheson short stories as a bonus feature so going through those. It was a damn fine read and inherently more interesting to me than most zombie stories (and indeed, the films based on the novel) because of the nature of the ending. It's just sci-fi enough to be twistedly neat, which is good.
I've never read Frankenstein either, it's on the short list going forward.
Frankenstein's alright, but my problem with it is really the only character worth a damn is the Monster. Which is fine - because he's easily one of the great characters of Gothic literature - but when Shelley wanders off to write another pre-sci-fi landmark, the apocalyptic novel The Last Man
... I really couldn't escape how terribly boring and sterile her all-too-damn-nice society folk are.