As the description on the video’s site notes, there is more to reviewing movies than simply giving a film a “thumbs up” or “thumbs down.” The major distinction here is between daily critics, who write for newspapers on a deadline basis, and more thoughtful critics, who really “unpack” films to get at what really makes them tick. The problem here is that many people confuse opinion with analysis; they’re two very different things. Saying that you like or don’t like a film, a song, a play, a painting, a sculpture — whatever — really tells the reader nothing other than what your personal feeling about the work in question is.
More serious criticism takes a film apart, and considers not only the director, but also the screenwriter, the cinematographer, the editor, the actors, the set designer, as well as examining the culture that produced the film in the first place, and how a film positions itself for a specific audience. And that’s just the beginning of things one might consider. There are many truly influential critics I don’t mention here, simply for reasons of space, but the important thing to remember is that daily film criticism is mostly opinion, rapidly rendered for a mass audience; more detailed work in film criticism takes time, effort, and a great deal of knowledge, and is aimed at those who view film both an art form, as well as a manifestation of popular culture.