I guess another reason that people like to read "reviews" is because they just enjoy the author's viewpoint and reading what they thought. They enjoy the author themselves.
I understand that the review in the traditional context is, as you said, maybe worthless in this day and age but I still really enjoy reading through your thoughts.
Someone summed it up better above - we maybe don't need the review, but we like reading them. Bring on the critical writing!
mongoose's comments