- very few back links
- not so great content
About very few back links you could say, yes the EMD lost it's value and thus rankings are gone, however to drop to position 300+ is a bit odd.
As I sell quite a lot of packages and also have my monthly service I saw a few people who cancelled cause they tanked. As a matter of fact I just had someone getting a little annoyed (not so strange of course) and saying that there was nothing wrong with his content. So I decided to run it through some spelling and grammar checker and it turned out there were a lot of errors.
So I started to compare some sites and are still ranking fine vs sites that tanked.
All the 5 sites that I looked at had many grammar/spelling errors.
The 5 sites that didn't tank only had 0 or 1 grammar/spelling errors.
Guess the times where you just outsource a crap piece of content for a few bucks are definitely over.