@esther Presentation can be an important factor, but an ad is an ad. My prev example also shows that we don't necessarily know what to look for in the first place.
I think we should ask questions like "What is the proper way to distribute information about different classes of products/services?" (the answers for medicine and fancy cars surely must be different) or "Why do we have ads in the first place?" so we won't throw out the baby with the bathwater.