Google Penguin Recovery Tips:

    De-optimize the web site
    Increase quality links to pages
    Make sure link anchor text is more natural
    Remove links from blogrolls
    Scale back the internal link anchor text
    Exact match domains hurt
    Practice negative SEO
    Move content to a new domain
    Build a smaller site with very few pages
    Write better content
    Add more social elements, i.e. Google+ Sharing
    Site audit to determine problem areas
    Think more long term with my site, stop taking short cuts

I totally agree with you, points mentioned in the post are all true. Use unique, fresh and quality content for all activities you are doing and be focused on quality back-links only. This will help you in improving your website impression in Search Engine.

i think we should be maintain quality back links and unique and relevant content.