As a publisher, you must have some really great ads, or some lackluster content that you get a "few percent" CTR on your ads.
One thing I always question, why do people care that they are getting a lot of impressions and few clicks on the content network. You are getting FREE advertising/impressions! While the sites may not be top-notch, they are still eyeballs. If you have setup your keyword themes for content site well, they should be somewhat relevant (yes, there are obvious exceptions like myspace, youtube, etc.)
Performance on the Content Network doesn't affect your QS on the search network. So a low CTR doesn't hurt you.
Ad copy is probably the most important factor to getting clicks on the content network. Your ads should probably be different that the ones you run on the search network, because the user is in a different mindset and is not actively looking for something in particular (usually).
Inreasing Max CPC might help you get better placement on these sites. In some ad units you are competing with 1-4 other ads, plus other units on the screen - you aren't the only choice for the user to click on.
Crummy CTR - this could be due to a few sites skewing the data. If there are a few high impression sites, with no clicks - you can filter them out - but again, WHY? Use the Placement report like the previous poster mentioned to see performance on individual sites.
Just because your ads don't get good CTR, doesn't mean others don't. Smart publishers will start to filter you out of their sites, if you ad isn't producing for them to make space for ads that produce. So the business model isn't failing b/c your ad has performed poorly so far.