There's this awesome tool called the Internet, and another awesome tool called Google. You can find all kinds of neat things on this tool - sports, gambling, porn, and even movie reviews. One can get a pretty good idea of what a movie is about without even seeing the movie themselves, and they can use those reviews to form an opinion of the movie without even having seen it. Pretty crazy, eh?

Of course, they can't post a personal review of the movie if they haven't seen it, but they can comment/ opine on the movie based off the reviews of others.