The only ads that really make sense, I think, are the branding/image/guiding type ads, not the performance-based CTR ads that have taken over the tubes.
Toyota did a whole damage control series during the purported uncontrolled acceleration debacle, and I noticed them and it influences your opinion. As do ads that build an image or general awareness: If I know about a brand of SSDs, maybe I'll search for that brand the next time I'm looking.
Ads that succeed or fail based upon a click have always been dumb. Remarkable that Google built a whole empire on it.