I just finished reading this yesterday and whilst I liked it, I thought it could have been much better.
It seemed to me that the intention of the author was to impose a dilemma upon the reader as to who to sympathise with more, Victor or the beast. That the balance of sympathy should shift from one to the other as events unfolded and facts became revealed. I did not feel that dilema. From the moment the beast was created and promptly abandoned to the moment on Victor's death bed when he looks back on his life and re-affirms he did the right thing, my sympathies lay firmly with the beast.
If it had been more of a dilemma, I would have enjoyed this book far more. It is interesting to read
HoopyFrood's comments on how he/she sympathised far more with Victor. To me, Victor was far more annoying. Despite the fact that Mary took great pains to paint him as someone highly regarded and deeply loved by the people that knew him, he came accross to me as completely self-obsessed and pathetic.
Nor did this strike me as an SF or horror story. Or at least the emphasis was not on thos elements but instead on the interplay between Victor and the beast and their emotional turmoil.