Once again, people dismiss ads as simply spam or something that provides no value to the search query when in study after study, at least on Adwords and SEM, paid results often boost relevance vs. a page only of organic results. This will of course differ by query and category of query but Google has already done a lot of work to make sure ads don't show for queries that have little to no commercial value or do not have enough query volume to risk jeopardizing the search experience.
If you're shopping for something, the paid and Google shopping results are often more relevant than the organic results since a lot of them incorporate real time price feeds or promotion codes. These are driven by the recognition of your shopping intent
Advertisers do not bid on keywords that deliver no economic value so it's in their best interest to only show up when they are the most relevant to your query. Through quality score, AdWords also shows ads that have been engaged with most often and with strong landing pages so that you don't get spammy ads or irrelevant ads that are unrelated to your query.