While despising mindless films with a passion, I would say there's room for both. (Neither do I like much of the pulp fiction of the 20s, 30s, and 40s that has justifiably fallen by the wayside, such as Seabury Quinn, to pick a single example; it can be fun, but it's not something you can go back to and enjoy again.) A lot of people -- my roommate, for example -- like "dumb comedies"; the stupider, the better. Me, I'd rather have my teeth drilled without anaesthesia. But as far as movies (or television) having, in some way, to be this way, or even (with movies) through the majority of their history predominantly aimed at this goal, that's nonsense. Citizen Kane, The Day the Earth Stood Still, The Haunting (1963), Casablanca, The Killing Fields, 2001: A Space Odyssey, The 7th Voyage of Sinbad, Last Year at Marienbad, The Golem, Metropolis, The Big Parade, City Lights, The General, Bringing Baby Home (a slapstick, but very intelligent, comedy), Jacob's Ladder, Pink Floyd's The Wall..... not to mention things like The Others, Ringu, Cries and Whispers, The Seventh Seal, Fannie and Alexander, Solaris (Tarkovsky is what I'm thinking of here) ... all of these are entertaining films, and don't even begin to scratch the surface of the number of such films out there throughout the history of cinema; and each is a textured film one can visit time and again and be enriched by as much as any book or symphony or sculpture or painting. (And I say this as someone who is almost excessively wedded to the printed word. At one point -- before having, for various reasons, to sell a huge chunk of my library, I had well over 7000 books, all but a handful of which I'd read.)
So, no. This is as valid an art form as any other, and has many bright while entertaining people in it as well. There may be more idiots in this than in, say, published books (though a good sampling of bestsellers from any period would tend to cast doubt on that), but there is no reason why it must be so inherently.