Judging by what I'm seeing in the various niches myself and close friends are in, as long as you have the strong quality links too, many links from different root domains are helpful, even if they're low quality. In other words, people are ranking highly with spam, moreso after panda 2.6.. at least that's what I'm seeing.
Dear! Panda Algorithm was launched just to penalize such websites which have low quality or copied content. According to my experience as an SEO and content writer, I suggest you that always write fresh and unique content to your site. You will never get down in SERPs.
Panda is an algorithm of google. It works for those who have submitted low quality as well as duplicate content and One should be suspended for this reason. So We should supply quality content.
You may read this Panda Survival guide for some quick Panda recovery tips, http://www.keywordcountry.com/blog/...nkings-changed-surviving-google-panda-update/