The minute an erstwhile review offers an opinion about the work being described, the review becomes criticism. If a reviewer says whether something is good or bad, worthwhile or not, he stops being a reviewer and becomes a critic. A critique adds the weight of its judgement to a review. Critiques set artistic standards. And to the extent that artists agree with the standards, criticism may influence the actual performance of an art.
Criticism is necessarily all opinion.
And since everyone is entitled to an opinion, we can't fault a critic for his opinion. We can, however, agree or disagree. And we can demand of critics that they provide logical reasons for their opinions. Reviews, on the other hand, should reflect no opinion. As purely descriptive enterprises, they should describe as objectively as possible.