Depends on the niche, really. I despise ads, but I can also admit to having learned about products from them that I have subsequently purchased and been pleased with.
Sometimes the ad lets me know about an entire type of product that I didn't know existed but found very useful, and I probably didn't even by the actual brand that was advertised.
If you consider the general concept of "letting people know what products are available for purchase", I think it's hard to disagree that it's a reasonable thing to do. That doesn't excuse the manner in which it is done today, of course, but that core functionality is not fundamentally evil.
There are still tests and reviews and content where people can show products without being paid by the people producing these products.
I haven't really, most of the products I've bought after advertising were low quality.
I do have some very high quality products that were recommended to me through friends. Like one local lady that makes really quality outfits. She doesn't advertise at all because she's already overwhelmed with orders as she's so good.
Advertising isn't the general concept of letting people know what products are available for purchase. It's more specifically doing this for money and showing it to people who don't want to see it. One might quibble about exactly what the word "advertising" encompasses, but that description covers the bad stuff pretty well, whatever name you want to give it.
I'd boil it down to: if you added a "don't show this" option, would anyone use it?
A catalog that comes in the mail because you requested it is not advertising, since you requested it. Products mentioned on the front page of this site aren't advertising, because they're organic, and it's part of what I'm here for. Classified ads, despite the name, don't really qualify since they're in a separate section that nobody reads unless they're specifically seeking out those ads.
A useful product doesn't have "don't show this" buttons because it would be completely pointless. I seek it out because I want it. I don't get upset at the company that made my office chair foisting it on me, because they didn't. I ordered the chair and got what I wanted.
But ad companies don't resist "skip" buttons because they think they're pointless because everyone loves their products. They resist "skip" buttons because they know people don't want to see their shit. Their entire business model is based around forcing people to see things they don't want to see, but might accept as part of a package deal for seeing the stuff they do want to see.
That is the stuff that should be completely destroyed.