There could be big drops for sites that are also heavily reliant on back-links etc from these content farm type sites.
Google is quoted as saying:
“Based on our testing, we’ve found the algorithm is very accurate at detecting site quality. If you believe your site is high-quality and has been impacted by this change, we encourage you to evaluate the different aspects of your site extensively. Google’s quality guidelines provide helpful information about how to improve your site. As sites change, our algorithmic rankings will update to reflect that. In addition, you’re welcome to post in our Webmaster Help Forums. While we aren’t making any manual exceptions, we will consider this feedback as we continue to refine our algorithms.”
The key tip here is to make sure that the most basic part of the online experience (how to find relevant information) is a key driver of your ongoing site development.
One thing is sure – don’t let Panda get mad (this is quite funny).