The big question that has been discussed online recently.
From my personal point of view I absolutely love it when an author comments on my reviews, it shows that they genuinely interested in what I, as a reviewer, think of their writing and its not just an avenue to get reviews posted on sites such as Amazon, Goodreads etc. It is great to know that the author appreciates your time in reading their book and it encourages you to keep on reviewing. I even get a little excited when I know the author has read my review !!
Alternatively the same will go for a reviewer, there are no courses or exams on how to review a book, therefore any feedback, good or bad, from the author should be considered and can only go towards improving your reviews in the future.
I always give my honest opinion on the books I review and have been lucky enough, up to now, to enjoy all the ones I have currently read. Some a lot more than others. In fact one of the most important things I have learnt since I started to review is not to decline a book simply on its cover or genre. This has happened a couple of times now, where normally I wouldn't have chosen the book and it has turned out to the one of the best books I have read, which then makes that book even more special and memorable.
What are your views, should an author comment on reviews?