The problem I have with ads right now is that the ecosystem for web ads specifically is poisonous. People who have ad inventory don't manage it well or respect the product they are making in enough cases that it hurts the market as a whole. On the other side I can't name an ad network that does web advertising in a reputable way. Furthermore there are some bad actors who exploit technology to abuse advertising on top of the product owners and the ad networks. With traditional media advertising was always a weird market but there was a respect of the product/business ad inventory that caused a push back. There is also a lot of sponsored advertisements right now which is a decent go-between but also is managed poorly. It's very easy to burn both sides of the bridge.

Admittedly having worked in advertising to an extent it's always going to be a grey market, but web advertising just seems to be a bit darker. There isn't enough money going around to refuse dodgy actors on the mid-low scale and that hurts the whole market.