Of course this shows another important point with reviewers: it's important to read the actual review rather than just the star rating. A good reviewer will explain not just whether they like a given movie (or book, album, etc.) but also why they feel that way. Even if your tastes differ from theirs, you can often get a good idea of whether you'll like something if you can see what they like and dislike about it in detail. Sites like Rotten Tomatoes give you the advantage of aggregating multiple reviews, but that comes at the expense of eliminating everything but the bottom line number.