I read two versions of Dracula last month.
Not only did the second one didnt show up in my stats because I didnt finish it until yesterday and harcover doesnt update until the book is marked as read (and only counts for the month i finished it on even though i read 99% of the book last month), but the rating is also shared between the two versions, even though I considered one to be 5 stars and the other 3.5/5.
I think the general rating should come from the average of all edition ratings, and we should be able to rate by edition and not the whole book.