I greatly enjoyed the Mystery category this month. It had been years since I'd read a mystery and I hope the categories for next year are equally challenging. I do note that it has been suggested twice that Science Fiction and Fantasy be split with one in one month and the other in another month. I strongly support this concept. I am not sure whether splitting the Mystery/Thriller category is as good an idea since I am not as familiar with thrillers vs mystery. One category that seems to be missing is Western, not sure how appealing it would be to all but it is a category that I've been meaning to read again.
I was disappointed to see History/Historical Fiction dropped, there are some very good books in those categories here at MR.