Big G devaluing my pages?

I have this Dutch autoblog which basically scrapes posts from 3 forums that all have the same category. I was getting 500 hits per day or so in Google traffic but today and yesterday; nada. Seriously, not a single hit.

So I did a google search on one particularly long-tail topic-name that was in both my database and one of the sites' -> My link was nowhere to be found. So I searched again, this time with quotes around it, and it did pop up. But then again, there were only 4 results to be shown.

So is it safe to assume google is devaluating my pages and throwing them on the bottom of the pile? The long tail keyword was seriously something like: "Omg I can't log into blablabla anymore (OH and btw I like jellyfish with sprinkles on top)" so it's kind of retarded it didn't show up within the first 3 pages.

I'm guessing with googles recent changes they picked up on the fact that my site was just rubbish. Anyone have any insight?

Some people's autoblogs are dying, some have seen increased earnings.

There are quite a few threads about it.

Maybe google's indexing algorithm has changed, you might need to do your homework here.