For me (though I am all too aware that this is not always the case with other reviewers) any review is an exploration. I am trying to work out to my own satisfaction why I respond in a particular way to this particular book. I may love it or hate it, or feel ambivalent about it (I think I like ambivalence most) but I am always curious why I feel that way. For that reason, even though I may never actually use a question mark, every review I write is really a set of questions. Though they are questions directed at me rather than at the author.