A good movie reviewer should be able to give favorable reviews of movies that are not to his or her taste  Because movie reviewers have seen so many movies, their tastes are very different from and usually better informed than those of most moviegoers
Yet the function of movie reviewers, as opposed to film critics, is to help people determine which movies they might enjoy seeing, not to help them better appreciate movies
If a movie reviewer is good, he or she should be able to give favorable reviews of movies that are not to his or her taste.