I personally have never seen a problem for sites using this type of things, a website like this is not the best way to go in terms of earning money because they always have to worry about keeping up-to-date with content that people are using or wanting to find and download so it would be hard for them to find that content and taking the time to do so. In this case, the ad system they have going on is not a problem, and I can understand them wanting to put a lot of ads in many places (if that was the case at least, they obviously do not do that), however, YouTube for example is ridiculous because they get a lot of revenue by itself with their parent company - Google, managing it.
I personally have my Adblock system off for the entire domain of this site as I know it helps, even a little so I really don't see why you're having a fuss about a few little ads compared to what sites like YouTube has.