To say Art isn't Art unless it's the highest form of art is silly. Is the work of a great comic book artist not art because it isn't Picasso?
Art is supposed to be emotionally engaging. What does a comic book do better?
An ad has "Buy this car! Buy this car! Buy this car!"
I deny ads work better when artistic. True, you remember them better. But often I totally miss what the product was, which makes them score Zero on the ad-o-meter. Do you remember the product for those 'artistic' Apple ads? Not good enough to say "some Apple thingy".