There is a Saas Project that I have been working on SEO for 1 year. One of our competitors has been ranked 3rd in 2 important keywords due to thousands of comment backlinks (all spam) it has received in an average of 18 months, hundreds of irrelevant forum links and promotional articles from hundreds of irrelevant and low-quality blog sites. And for about 1 year.
What do you say to that :)