Some of my sites droped off google arround the 28-29th september 2012 !

Hello all,

in my personal opinion, this was not a great move from Google.
what google should be doing is not deranking EMD but to scrutinize the websites having EMD and hosting irrelavant content. When there is a website selling Used Mobiles, its great to have a domain name with the keywords in the domain - thats exactly what they are doing. but in case they say "used mobiles" and sell cars, they should be deranked! Someone help me understand their logic in deranking legit websites?

regards,
Josh