I haven't watched it, but the problem is twofold...(1) The problem with reviews is that if they don't like the movie, they're bound to say so---but, even though ninety-nine percent of the people on this planet hate it beyond measure (or would if they saw it), there'll still be one percent who love it (or would if they...well, you get the idea).
So if there are six billion people on this planet---I don't have the current numbers---that's still six million people, or, considerably more than the number of people who reviewed it on Rotten Tomatoes.
(2) The problem with reviewers, the professional kind, is that they spend so much time seeing so many movies so often, that they're so jaded they can't accept that something that doesn't meet their high standards can be any good. (The recent career of Roger Ebert is a good example of what happens when someone's done this too long.)
Sometimes you can catch a reviewer whose likes and dislikes are a close match for your own, or even one who's a near-mirror-image of yours. Still, there are problems. (Leonard Maltin's Movie Guide gave a bad review to "WALL-E," and I haven't forgiven him yet for it.)