Here are a few recent blog posts with info about how SearchWiki works and reactions to SearchWiki:

• Google SearchWiki: Blessing or Boondoggle?
• Google SearchWIKI: A Grand Shift in SEO?
• SearchWiki: Six Implications For Public Relations Professionals
• SearchWiki: Boon for Google, Bust for Privacy
• Google SearchWiki: Toy or Trash?
• Q&A With Google On SearchWiki (Don’t Expect An Opt-Out Soon)

The bottom line is that you want your site to generate only positive comments!  Your visitor feedback will depend on the quality of your content.  If you’ve done a good job of designing and building your site using  relevant content without using any SEO “tricks” you should be fine.

For some good basic advice download the Google Search Engine Optimization Starter Guide