Mine was dropped in 2011 when Panda hit it. I had worked on it for 1-2 years, probably has 100 articles. It dropped from around 1000 visits a day to less than 100. Now it's hovering around the 150 a day. All unique content, still don't know why Panda hit it, but it did.
It's almost worth just sitting back and doing nothing. My main site, which I've worked my backside off, continues to plummet. I did everything, and I really mean EVERYTHING that Google recommended, and it didn't stop the bloodbath.
But, I was checking out a major competitor of mine today. I noticed I hadn't seen them around in search much. They've been hit much worse than me. I'm an "enthusiast", but this site is run by people actually in the profession, and the site has been crucified. The content is exceptional, they must be hurting. This is definitely not an issue on quality of content because both of our sites are of a high quality when it comes to content.
I'm not here to attack Matt Cutts, despite what people think of me! But I do have to wonder why Google are hitting good sites in favour of rubbish. This isn't just recent, it's been going on since early this year. My competitor seems to have been hit at the same time as me. Why on earth is wikihow doing so well now?
I know, I know, I should stop whinging. It's just so incredibly frustrating.