aaronpkactually you see this on youtube videos when the video is a "how to do X" tutorial too, if the video starts out with a random story or a lot of fluff, people in the comments get angry
aaronpkinterestingly, in both cases it's not the ads that are the problem, it's the first person content from the author that triggers that response. people are more willing to just skip and ignore the ads and accept it as a necessary evil
[tantek]gRegor has the basic gist of it, it's the UI antipattern of an app interrupting you with any kind of prompt that has nothing to do with what you are trying to do, and serves what the app (service) wants, not what you want