I have been hit by google in one of my main keyword and I think while new algo of google is does help to curb some scammer but it is hurting legit site a log.
For one of the major keyword I use to rank 2-6 but then from last few months I was hovering around 20-22 , I checked and on my site I was not using it anchor anywhere alone, so I actually made a little change there was an SITE-wide anchor like "myKeyword-otherKeywoard", took otherKeyword out of link and blast..
few days after that I can't find my site anywhere in google for "myKeyword" anymore.
What it looks like , if you have site and keyword anchored link is added gradually then google loves it and if you add it all of sudden and it reflects on 10ks of pages at once then you are doomed..
But then what if I have site I decide to change link of menu anchor.. thats bad.. it will hit me while I have no intention to manipulate rankings.. isn't ?