I think the similarities to what we see is related more to focus than anything. I've spell checked the daylights out of my site and have a continuing program of improving readability, reducing verbosity and eliminating dupes.
Funny thing is, I have one blog page about red and black beetles that drags in a TON of visitors. It's hardly related to my overall topic, but G loves that page....even griped about it in WMT when I temporarily removed it.
Side note - yesterday was the best traffic and conversion day since April 2013. Traffic is picking up slowly, but that's the usual seasonal uptick and fully expected.