>> opt out <<
Two choices here, change your prefs to text only, and you'll get rid of most targeted ads. That's most, not all.
The other choice is to email support and ask them to turm off targeting for your site.
Now, is targeting good or bad?
Depends on the site, topic, audience, etc.
My own experience is that leaving targeting on is better than turning it off. I just tried using text only on a significant part of my site last month, the results were not good.
I went back to text and images, which results in more targeted ads.