I think that's terribly dismissive. I mean, take Ebert's reviews of the Mummy series for example. There's something touching and wise in there that actually makes the films themselves better because they give us pause to reflect on these things.
Or in a completely different ballpark, the Red Letter Media "review" of Star Wars Ep. 1 that manages to be not only a valid critique of the film, but is longer than the film and arguably a better film in its own right!
(Edit: Another good example that just occurred to me is one that I heard in a recent episode of the Rest Is History podcast. They were discussing Tolkien and one of the hosts pointed out that even if he hadn't written any of his Middle Earth fiction, he'd still be well-known in literary circles for his critical examination of Beowulf that changed how we see it today.)
Like any other "content" there's a spectrum from prolefeed and seo spam on one end, and actual art and literature on the other. Pull that rabbit out of a hat enough times and there's definitely a niche to carve out a legend there.