This may seem a bit pedantic, slightly semantic, but would there be any chance of rewording or adding an option to the "was this review helpful to you"?
Given that the overwhelming majority of reviews on this site are gushing, uncritical expressions of unbounded and uncritical enthusiasm, it's refreshing to read reviews that display evidence of care and attention. Even when I disagree with a user's opinion, if they have expressed it well and thoughtfully, I would love to be able to give them a thumbs up.
However, so far none of those well-written analytical reviews have really been "helpful" to me, because I've already watched the Drama in question. So an option to simply upvote the review without having to designate it as "helpful would indeed be, somewhat ironically, "helpful". :)